South Sea Company shares surged and collapsed in 1720 amid debt conversion plans, promotions and political influence. The South Sea Bubble makes people look foolish until you consider their incentives.
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Investors evaluated changing expectations about state finance and commercial privileges, not merely colorful rumors. A rising price can become its own very persuasive argument.
There were real financial arrangements underneath the excitement, not just fantasy. Market manipulation and asymmetrical information made the episode more complex than a story about a universally foolish crowd.
A stock-price chart alone cannot establish what each contemporary knew or believed before the collapse. Reducing everyone involved to gullible speculators misses the institutional story.
How would you separate political favoritism, financial innovation and speculative feedback in the 1720 boom?