For the most part HFT just decreases or eliminates arbitrage opportunities, or price discrepancies between what a piece of information says the price will be an

For the most part HFT just decreases or eliminates arbitrage opportunities, or price discrepancies between what a piece of information says the price will be and what the price currently is. Arbitrage has always been a 'feature' of the market and although there are increased barriers to entry for arbitrage, economic theory says that by eliminating arbitrage opportunities through trading the difference away the market is being made more efficient