Another answer lies in shifting investor expectations of market shocks, five years after the U.S. "flash crash" that briefly wiped out nearly $1 trillion in market value and seven years after the subprime crisis pushed investment bank Lehman Brothers into bankruptcy and redrew the financial landscape.
What is the relationship between 'Lehman Brothers' and 'investment bank' in the context of the input sentence.
Options: developer, product/material produced, legal form, owned by