The inevitable levering of asset structures to double or quadruple returns relative to risk-freeassets?
资产结构无可避免应加入杠杆操作，以便将报酬率相对于无风险报酬率放大两倍或四倍？
2
The author also considered the optimum portfolio selection problem with risk-freeassets and gave a instance to show how to solve the problem.
进而，本文考察了加入无风险资产后的最优组合问题，并给出了一个例子的求解。
3
U.S. Treasury bills are the textbook definition of a safe haven asset, historically one of the most risk-freeassets you can buy next to precious metals.