Don't Turn Your Back On Diversification Now

This year, next year or a few years from now, scores of (mostly) new investors will ask:

“Why should we invest in VWRA, a global stock index? They focus heavily on slow-growing economies such as the U.S. and developed Europe. Yet emerging markets are the future. They have scorching GDP, much higher recent stock returns and they obviously represent the future, not the past.”

Here's my response to the multitude of queries that will echo this sentiment.