4.1The claim
Mackay tells the South Sea episode as a story whose end is present from the first page, and the clearest sign is how he treats the people who warned. A member of the Commons who spoke against the scheme becomes, in the telling, a man speaking "In a prophetic spirit", and the peers who warned are said to have spoken to ears already seized by frenzy. The same pages also preserve, without comment, signs that the outcome was not plain at the time: a "general opinion", a panic whose "form and dimensions" nobody knew, and a letter whose writer, after the fall had begun, says he had foreseen it "From the very beginning". Read beside the synthetic voyage record, these passages add to the first position in the debate. Hindsight bias, which Fischhoff describes as a change in the probability a person assigns, appears in a narrative as a change in who counts as having known.
4.2The Preface: a book about crowds, told by the one who recovered
Mackay's Preface frames everything that follows. Its paragraph on money is the one the parent study's rules allow to be quoted, and it is worth reading in full:
Money, again, has often been a cause of the delusion of multitudes. Sober nations have all at once become desperate gamblers, and risked almost their existence upon the turn of a piece of paper. To trace the history of the most prominent of these delusions is the object of the present pages. Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, and one by one.
The last sentence sets the narrator's position: the far side of recovery. The herd went mad; individuals recovered; the book is written by one who has recovered, for readers invited to count themselves among the recovered. That is the position of hindsight. It is no special fault of Mackay's, since any history of a mania is written by someone who knows it was one. But it means that the word "delusion" is assigned from the end. A belief is a delusion in this book because it turned out false and was widely held.
The Preface also tells the reader what kind of book this is:
The present may be considered more of a miscellany of delusions than a history--a chapter only in the great and awful book of human folly which yet remains to be written, and which Porson once jestingly said he would write in five hundred volumes!
A "book of human folly" collects cases by their ending. Folly is a verdict, and the verdict comes first. Mackay is open about this: his book does not pretend to judge decisions from what was known at the time. Its claim for the South Sea chapter is completeness, not neutrality:
The memoirs of the South-Sea madness and the Mississippi delusion are more complete and copious than are to be found elsewhere;
The word "madness" is in the chapter's description before the chapter begins.
4.3The directors' reasoning, given to them by the teller
Before the scheme is laid before Parliament, Mackay gives the directors a state of mind. Having watched John Law's scheme in France, the chapter says, they thought they could do the same in England:
Wise in their own conceit, they imagined they could avoid his faults, carry on their schemes for ever, and stretch the cord of credit to its extremest tension, without causing it to snap asunder.
This is a reason assigned by a narrator who knows that the cord snapped. Nothing here quotes a director saying anything of the kind. The image the sentence gives the directors is built out of the outcome: the cord, the tension, the snap. Had the scheme held, the same imagining would have been called confidence, or not mentioned. This is the narrative form of the thread insight in WSTiger's records: that once the outcome occurs, "memory and evaluation rewrite the reason to fit the outcome". Mackay is not remembering the directors' reasons. He is supplying them, from the end.
4.4Walpole, the raven and Cassandra
Mackay's account of the Commons debate is the chapter's fullest instance of a warning made into a prophecy. It turns to the one member who opposed the bill:
Mr. Walpole was almost the only statesman in the House who spoke out boldly against it. He warned them, in eloquent and solemn language, of the evils that would ensue.
There follows a passage in quotation marks, given as Walpole's words, warning against "the dangerous practice of stock-jobbing" and a scheme that promised "dividends out of funds which could never be adequate to the purpose". Then Mackay summarises the rest of the speech in his own voice, and here the telling changes register:
In a prophetic spirit he added, that if the plan succeeded, the directors would become masters of the government, form a new and absolute aristocracy in the kingdom, and control the resolutions of the legislature. If it failed, which he was convinced it would, the result would bring general discontent and ruin upon the country. Such would be the delusion, that when the evil day came, as come it would, the people would start up, as from a dream, and ask themselves if these things could have been true. All his eloquence was in vain. He was looked upon as a false prophet, or compared to the hoarse raven, croaking omens of evil. His friends, however, compared him to Cassandra, predicting evils which would only be believed when they came home to men's hearths, and stared them in the face at their own boards.
The passage holds three judgments of one speech. The House's, at the time: a "false prophet", a "hoarse raven". His friends', also at the time: Cassandra, whose warnings are true and disbelieved. Mackay's, more than a century later: "In a prophetic spirit". The first two disagree because the outcome was not yet known; the third settles the disagreement by the outcome. Walpole was a prophet because the evil day came.
Two details matter. The speech, as Mackay reports it, predicted two outcomes, not one. In one branch, "if the plan succeeded", the directors would become masters of the government; in the other, "If it failed", there would be ruin. A speech that names both branches of a fork cannot be proved prophetic by the arrival of one of them, unless the speaker also said which branch was more likely. Mackay supplies that: "which he was convinced it would". Whether the conviction was Walpole's at the time or Mackay's attribution, the text does not let a reader tell. And the phrase "as come it would" sits inside the reported speech, but its confidence is the narrator's: knowledge of the end, lent to a speaker who did not yet have it.
This is creeping determinism in prose. Where Fischhoff (1975) speaks of people judging a known outcome more likely, Mackay's narrative assigns not a probability but a status. Walpole becomes the one who knew; the House becomes the ones who would not listen. The outcome has been converted into a distinction between people.
The Cassandra comparison sharpens the point. Cassandra in the myth is always right, so to call a speaker Cassandra is to say that the speaker will be proved right. The friends who used it at the time were making a forecast; Mackay, repeating it after the outcome, makes it a verdict.
4.5The peers, and the ears that were "dull, cold"
The same pattern appears in the account of the debate in the Lords:
Several peers spoke warmly against the scheme; but their warnings fell upon dull, cold ears. A speculating frenzy had seized them as well as the plebeians.
The second sentence explains the first: the peers who voted for the bill did so because a frenzy had seized them. Had the scheme held, their votes would need no explanation; only because it failed do they become a symptom. Mackay does not report what the majority said in reply, except that one earl "endeavoured to answer all objections". The objectors are given their arguments in detail: one said the bill was "unjust in its nature", another compared it to the horse of Troy. The answers are not given. A telling that keeps the warnings and drops the replies has already decided the case.
Later in the chapter, Mackay returns to the warners:
Sensible men beheld the extraordinary infatuation of the people with sorrow and alarm. There were some both in and out of parliament who foresaw clearly the ruin that was impending. Mr. Walpole did not cease his gloomy forebodings. His fears were shared by all the thinking few, and impressed most forcibly upon the government.
The words "Sensible", "foresaw clearly" and "the thinking few" sort people by the outcome: those who feared ruin were sensible because ruin came. A reader cannot recover from this telling how many people held other fears that were never proved right because what they feared did not happen.
4.6What the telling lets in: the "general opinion" and the panic nobody could measure
Mackay is not consistent in this, and his inconsistency is evidence. In two places the chapter records how things looked to people inside the episode, and in both the picture is of uncertainty, not of delusion. The first is at the height of the rise:
It was now the general opinion that the stock could rise no higher, and many persons took that opportunity of selling out, with a view of realising their profits.
The "general opinion" here is not that of deluded crowds. It is a judgment that the rise was over, and those who acted on it sold. The sentence fits poorly with the Preface's herd, which goes mad together; here the herd is reading the market and getting out. The chapter does not reconcile the two.
The second is from the time of the fall, in a speech Mackay reports at a meeting of the company:
One of the speakers, a Mr. Pulteney, said it was most surprising to see the extraordinary panic which had seized upon the people. Men were running to and fro in alarm and terror, their imaginations filled with some great calamity, the form and dimensions of which nobody knew:
The phrase "the form and dimensions of which nobody knew" describes uncertainty from inside it: the outcome was not yet a fact but a fear of something whose size could not be stated. Mackay quotes it, adds two lines of verse, and goes on to tell the outcome. The sentence survives as a trace of how the moment looked before its end was written.
4.7A letter written after the turn, claiming the beginning
The most useful document in the chapter for this question is a pair of letters Mackay quotes from a member of the Commons, Mr. Broderick, to Lord Chancellor Middleton, as printed in a work by Coxe on Walpole. Mackay dates the first to the thirteenth of September, after the stock had begun to fall. It opens:
Various are the conjectures why the South-Sea directors have suffered the cloud to break so early. I made no doubt but they would do so when they found it to their advantage.
Ten days later, Mackay says, the writer wrote again, with the stock still falling, and ended:
From the very beginning, I founded my judgment of the whole affair upon the unquestionable maxim, that ten millions (which is more than our running cash) could not circulate two hundred millions, beyond which our paper credit extended. That, therefore, whenever that should become doubtful, be the cause what it would, our noble state machine must inevitably fall to the ground.
The figures are the letter-writer's as Mackay prints them, and nothing here rests on them. What matters is the tense. Written during the fall, the letter claims a judgment made "From the very beginning". There is no way, from Mackay's chapter, to check the claim. The writer may have believed exactly this from the start, or come to believe it as the price fell. The letter cannot tell the two apart, and neither, if Fischhoff is right that people do not realise the knowledge changed their judgment, can its writer.
The first letter is more revealing still. "I made no doubt but they would do so" is said of an event the preceding sentence calls the subject of "Various" conjectures. The certainty is claimed after the event and set against other people's uncertainty at the same moment.
Mackay uses the letters as testimony to what was happening in September, which is fair. Here they serve as the chapter's clearest example of a reason that could have been written before and was in fact written after. Had the writer set down his maxim in a letter of the spring, before the rise, it would be evidence of foresight. Set down in the autumn, it is evidence of how the autumn looked.
4.8A footnote on advice vindicated
A footnote shows the pattern in miniature. It tells of the poet Gay, who had been given stock and believed himself rich, and cites Johnson's Lives of the Poets. It reads in part:
His friends persuaded him to sell his share, but he dreamed of dignity and splendour, and could not hear to obstruct his own fortune.
(The transcription reads "hear" where the sense wants "bear"; the quotation keeps the transcription's word.) The footnote then gives the friends' further advice, to sell enough for a small income for life, and ends:
This counsel was rejected; the profit and principal were lost, and Gay sunk under the calamity so low that his life became in danger.
This is the shape of the effect Baron and Hershey describe, set as a moral tale. The counsel is good because the stock fell; the refusal is a dream "of dignity and splendour" because the stock fell. Had the stock held, the refusal would read as nerve and the counsel as timidity. The footnote gives the advice, the refusal and the ruin, in that order, and lets the third judge the first two.
4.9The record: a log kept before each voyage
WSTiger's record Reason written before voyage sets a scene that answers to exactly what the Broderick letters lack. The setting is synthetic: an invented trader and partner, dated 1956 by the record, with no real ship, voyage or firm behind them.
A virtual trader, each time deciding whether to send a ship, writes in a log the reason for the choice and the expected risks. The business partner accuses the trader of having made a wrong judgment regarding a decision that lost a ship to a storm.
The scene has two parts that Mackay's chapter lacks. One is the log: the reason was written "each time", before the outcome, with "the expected risks". Whether or not the storm was among those risks, the log was not written by someone who knew the ship would be lost. The other is the accuser, whose charge is the one Mackay's narrative makes against the House of Commons: the decision was wrong, and the loss proves it.
The question the record poses lays out the three positions of the debate in its own words:
Should judgment be evaluated based on the outcome, re-evaluated based on the information available at the time as recorded in the log, or evaluated based on the cumulative outcomes of similar decisions?
The first option, "based on the outcome", is the partner's and, in his narrative mode, Mackay's. The second, "the information available at the time as recorded in the log", is the first position's remedy. The third, "the cumulative outcomes of similar decisions", is the second position's. The record does not choose. Its example judgment states what it wants kept apart:
This is an example that distinguishes a bad outcome from a bad decision. Information available at the time, and information learned afterward after seeing the outcome, are written down separately.
The second sentence describes a practice, not a verdict: two kinds of information, written in two places. In the Broderick letters they are written in one; the knowledge of the fall and the claim of early judgment sit together, and nothing marks which is which. A log of the kind the record describes would have kept the maxim, if there was one, on a page dated before the rise.
4.10What the case adds
Mackay's chapter shows hindsight working on a story rather than a rating: warners become prophets, the majority a frenzied crowd, the directors are given reasons built from the outcome, and a letter written during the fall claims a judgment made at the start. The chapter also lets in traces of how the episode looked before it ended. For the first position in the debate, the case describes what creeping determinism does to a narrative: it turns the outcome into a distinction between those who knew and those who did not. The synthetic voyage record names the remedy, a reason written before and kept apart from what came after, which is what the Broderick letters could not show.