A simple mantra has helped a $12 billion investor crush the market for the past decade (LVMH, BA)

Oppenheimer Global Fund, a portfolio of large-cap US and international stocks, has outperformed its MSCI benchmark index since 2008. Co-fund manager John Delano told Business Insider the fund uses a thematic approach that fits into the acronym MANTRA, which stands for Mass Affluence, New Technology, Restructuring, and Aging. For example, mass affluence is based on the bet that the world is going to get richer. As such, the fund is invested in luxury brands including LVMH.   The stock...