This 1 chart shows the U.S. stock market is the most expensive in the world By: MarketWatch December 28, 2017 at 14:23 PM EST It was basically impossible for stock-market investors to lose money in 2017. In 2018, it might be difficult not to. Read More >> Related Stocks: FTSE EM ETF Vanguard Japan Ishares MSCI ETF Standard & Poors 500 UK Ishares MSCI ETF