NEW YORK ( ETF Expert) -- It is the third-largest provider of ETFs. It successfully leveraged its reputation as the low-cost leader of indexing. Regardless of your investment approach or philosophy,Vanguard offers more than 65 vehicles to get you to your destination. Halfway through 2013, it makes sense to evaluate the impact of a variety of market movers (e.g., global economy, central bank policies, geopolitical backdrop, corporate well-being, etc.) on different asset classes. I thought it might make sense to do so in the context of the products that Vanguard offers. 1. U.S. stocks via Vanguard Total Stock Market (VTI). Corporate earnings have remained reasonably strong over the past 12 months, though profitability has largely been a function of debt restructuring and productivity increases. In contrast, actual sales numbers have been flat. Higher interest rates have already caused consumers to slow down on big ticket purchases. What's more, economic contraction in Europe as well as global political upheaval are likely to affect forward guidance for U.S. companies. Even the technical resistance of the 50-day moving average is giving bearish traders food for thought.