Every stock investor knows the basic principle of buying low and selling high. Recently I am thinking this value approach to stock investing actually have a diversification benefits. I can not theoretically approve my hypothesis. However, I have the following reasoning.
Since most of my investments are done via mutual funds, closed-end funds, or exchange-traded funds, so my reasoning is based on the trading of funds, especially the sector funds and specialty funds.
Recently, the US stock market is very volatile. Some sectors or industries like the financial sector and the homebuilding industry have suffered much more than other sectors/industries.
Let’s take the homebuilding industry as an example. Since the summer of 2005, the homebuilding industry has been declining while the overall market is moving upward. Toll Brothers is falling from the high $50s per share to the low $20s per share during the period from July 2005 till now. During this period the SPY has risen from $120s per share to around $145 per share.
This divergence between the homebuilding industry and the overall market represented by SPY gives the value investors a dynamic diversification benefits if the value investors are adding shares in funds or companies related to the homebuilding industry. Over time this divergence will diminish when the homebuilding industry are aligned with the overall market.
If the value investors always invest this way, they can build very dynamically diversified investment portfolios.
If we consider the buying low and selling high as a temporal diversification strategy for portfolio management, then value investing can be treated as a spatial diversification strategy. This pair of temporal and spatial diversification strategies can complement each to form a time-space consistent investment strategy.