Answer:
The answer is: weak form efficiency
Explanation:
The efficient market hypothesis is a financial theory that puts forward the concept of informational efficiency in capital markets. The weak form of informational efficiency dictates that the past price data and market expectations are already included in the price movements of an asset in a given capital market. If this holds true, then technical analysis (examining historical price data of an asset) will not yield any benefits when evaluating investment decisions. If Anderson can generate abnormal returns via technical analysis then the market is not weak form efficient.