On further thought, you're right: they contain 2v and v OR v and v/2. The mistake in the author's reasoning is to consider the expectation based on a variable starting point. This will lead to a factor of 4 in the two sums of money (2x and 1/2x).

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## I agree

On further thought, you're right:

they contain 2v and v OR v and v/2.The mistake in the author's reasoning is to consider the expectation based on a variable starting point. This will lead to a factor of 4 in the two sums of money (2x and 1/2x).