老师您好，在影响corridor宽窄的因素中，asset class volatility 越高，则从corridor越窄，但是在原版书（第十七章）课后习题第二题中，说high-risk asset的是wider。是否矛盾？
题目如下：
The firm’s policy is to rebalance a portfolio when the asset class weight falls outside
of a corridor around the target allocation. The width of each corridor is customized
for each client and proportional to the target allocation. Beade recommends wider
corridor widths for high-risk asset classes, narrower corridor widths for less liquid
asset classes, and narrower corridor widths for taxable clients with high capital gains
tax rates.
Beade’s suggested change in the corridor width of the rebalancing policy is correct regarding:
A high-risk asset classes.
B less liquid asset classes.
C taxable clients with high capital gains tax rates
A is correct. Higher-risk assets should have a wider corridor to avoid frequent,
costly rebalancing. Beade’s other suggestions are not correct. Less liquid asset
classes should have a wider, not narrower, corridor width. Less liquid assets
should have a wider corridor to avoid frequent rebalancing. For taxable investors, transactions trigger capital gains in jurisdictions that tax them. For such
investors, higher tax rates on capital gains should be associated with wider (not
narrower) corridor widths.
