The <a href="https://en.wikipedia.org/wiki/S&amp;P_500" id="mwAWE" rel="mw:WikiLink" title="S&amp;P 500">S&amp;P 500</a> <a href="https://en.wikipedia.org/wiki/Stock_market_index" id="mwAWI" rel="mw:WikiLink" title="Stock market index">stock market index</a> is introduced, replacing the S&amp;P 90.