In finance, the weak form of efficient market hypothesis shows that historical stock price and trading volume data can not provide basis for prediction. Prices. In this paper we show that, to the contract, future intra day stock prices could be predicted effectively until 2009. We demonstrate this using two different configurable machine learning based trading strategies. However, the effectiveness of both approaches diminutive over time, and neither of them are profitable after 2009. We present our implementation and results in detail for the period 2003-2017 and propose a novel idea: the use of such flexible machine learning methods as an objective measure of relative market efficiency. We conclude with a candidate explanation, Comparing our return over time with high-frequency trading volume, and suggest concrete steps for further investment<br>
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