问题如下：
Which of the following statements about
large dealer bank is NOT correct?
选项：
A. Large dealer banks have
economies of scope in information technology and innovation.
For
larger dealer banks, the diseconomies of scope in risk management exists, as it
is too difficult to comprehend or control some of the risk-taking activities
inside their own firms.
The
similarity between a traditional bank run and a liquidity crisis at a dealer
bank concerns the fear (perception) of solvency which leads participants to act
to reduce their potential losses.
Like insured depositors at a commercial
bank, many of those with exposures to dealer banks also have default insurance.
解释：
考点：对The Failure Mechanics of Dealer Banks的理解
答案：D选项表述错误，本题选D
解析：
D选项描述错误，Dealer bank和Commercial bank的一大区别就是，Commercial bank存在deposit insurance，而对于Dealer bank绝大多数Exposure没有Insurance。
Unlike insured depositors at a commercial bank, many of those with exposures to
dealer banks have no default insurance, or do not wish to bear the frictional
costs of involvement in the bank’s failure procedures even if they do have
insurance
A为什么正确呢？不是在风险管理方面由于信息获取等原因规模不经济吗
