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Some side effects

Auctions are a method of squeezing out speculators from a transaction, but they may have their own perverse effects; see winner's curse. The winner's curse is however not very significant to markets with high liquidity for both buyers and sellers, as the auction for selling the product and the auction for buying the product occur simultaneously, and the two prices are separated only by a relatively small spread. This mechanism prevents the winner's curse phenomenon from causing mispricing to any degree greater than the spread.

Speculative purchasing can also create inflationary pressure, causing particular prices to increase above their true value (real value - adjusted for inflation) simply because the speculative purchasing artificially increases the demand. Speculative selling can also have the opposite effect, causing prices to artificially decrease below their true value in a similar fashion. In various situations, price rises due to speculative purchasing cause further speculative purchasing in the hope that the price will continue to rise. This creates a positive feedback loop in which prices rise dramatically above the underlying value or worth of the items. This is known as an economic bubble. Such a period of increasing speculative purchasing is typically followed by one of speculative selling in which the price falls significantly, in extreme cases this may lead to crashes. Overall, the participation of speculators in financial markets tends to be accompanied by significant increase in short-term market volatility. This is not necessarily a bad thing, as heightened level of volatility implies that the market will be able to correct perceived mispricings more rapidly and in a more drastic manner.