A key variable of market efficiency is the certainty of the income stream. The most efficient market is for corporate securities.
The most efficient market is for U.S. securities, particularly the short-term U.S. Treasury Bill.

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The Answer of A key variable of market efficiency is the certainty of the income stream. The most efficient market is for corporate securities.
The most efficient market is for U.S. securities, particularly the short-term U.S. Treasury Bill.

A Key Variable of Market Efficiency Is the Certainty of the Income