Following JPMorgan Chase's significant acquisition of First Republic Bank in 2023, how does the Efficient Market Hypothesis (EMH) explain the market's reaction to major corporate financial decisions, and what implications does this have for a company's approach to capital structure and dividend policy? Consider how information asymmetry between management and investors affects market efficiency, particularly during periods of banking sector stress, and analyze how the market's processing of complex financial information influences both the timing and structure of major corporate actions like acquisitions, stock buybacks, or dividend changes. Examine the relationship between market efficiency and the speed at which new information is incorporated into stock prices, especially in cases involving large financial institutions where systemic risks may be a concern.