Use the following table to answer the question below.

	Expected ret.	std. dev.
S&P500	16%	20%
T-bill	8%	0%

What is the level of risk aversion that will make an investor neither borrow nor lend? Assume that the lending rate equals the T-bill rate.

Round your answer to 4 decimal places. For example, if your answer is 3.205%, then please write down 0.0321.