Share this article Share The Nikkei 225 is the biggest gauge of global equity markets, but there is a market inefficiency at work.It is worth $12.42 trillion, according to FactSet, an index of companies in the S&P 500 compiled by Bloomberg Intelligence.That puts the Nikkeit on par with Exxon Mobil ($13.7 trillion) and JPMorgan Chase & Co. ($13 trillion).But it […]