请教各位大侠，为什么
“SEC regulation forbid the trading of options side by side with their
underlying instruments” while "there is no
prohibitions for side by side trading under CFTC rules."
该如何理解：
“The future exchanges were able to add an attractive instrument to their
product lines. THe side by side
trading of the option and its underlying futures made for excellent
arbitrage linkages between these
instruments”
多谢了～～～～
