the durkinInvesting agency has been the best stock picker in the country for the past two years. before this rise to fame occured, the durkin newsletter had 200 subscrbers.those subscribers best the market consistently, earning substantially higher returns after adjustment for risk and transaction costs. subscriptions have skyrocketed to 10000. now when the durkin investing agency recommends a stock,the price instantly rise several points. the subscribers currently earn only a normal return when they buy recommended stock because the price rises before any body can act on the information. briefly explain this phenomenon . is durkin`s ability to pick stocks consistent with market efficiently?