“Risk on” again, anyone? Judging by the way the market behaved Wednesday, such a thought may have popped in some investors’ heads. There are reasons to justify it. Unlike Tuesday, when one key index rose while another fell, the major averages on Wednesday rose in unison. The Nasdaq composite gained nearly 0.7%. It also wiped away the prior two days’ worth of measly losses. The S&P 500 was only a few steps behind, up 0.5%.