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I am a buyer of silver on a pullback to around 12.5 - 13.0$
Stock Traders Find Speed Pays, in Milliseconds (New York Times):
It is the hot new thing on Wall Street, a way for a handful of traders to master the stock market, peek at investors’ orders and, critics say, even subtly manipulate share prices. It is called high-frequency trading — and it is suddenly one of the most talked-about and mysterious forces in the markets.
Powerful computers, some housed right next to the machines that drive marketplaces like the New York Stock Exchange, enable high-frequency traders to transmit millions of orders at lightning speed and, their detractors contend, reap billions at everyone else’s expense.
These systems are so fast they can outsmart or outrun other investors, humans and computers alike. And after growing in the shadows for years, they are generating lots of talk.
Read also this article: Is Wall Street Picking Our Pockets?
"In an illiquid market the same size of sell order will push the market down further than in a liquid market. Imagine a market where there is a large number of market participants, using the exact same information set, in the exact same way, to trade the exact same financial instruments. When one buys they all do and vice versa. Market participants would face volatility and illiquidity when they came to buy or sell. This would not be reduced by having more players, only by increasing the amount of diversity in their actions. (Indeed, on these assumptions it is possible to show that the bigger the market was, the less liquid it would be). Now imagine a market with just two players but with opposite objectives or opposite ways of defining value. When one wants to buy the other wants to sell. This market is small, but the price impact of trading would be low and liquidity would be high."
"Diversity matters and probably more so than size in the development of liquid financial markets. Markets can be large, but prone to troublesome liquidity black holes if they are not diverse. This can be seen in the foreign exchange markets today and there are worrying signs that diversity is falling in other major financial markets. Diversity relates to numbers of players and instruments, but in markets prone to herding, a critical role is played by the diversity of decision rules. Market-sensitive risk management systems reduce diversity of decision rules and the encouragement by regulators for these systems to be used across industry players will increase the number of liquidity black holes."