Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

To rebalance or not to rebalance
'Buy and Hold' Is Still a Winner: An investor who used index funds and stayed the course could have earned satisfactory returns even during the first decade of the 21st century. by By Burton G. Malkiel in The Wall Street Journal on November 18, 2010: "The other useful technique is "rebalancing," keeping the portfolio asset allocation consistent with the investor's risk tolerance. For example, suppose an investor was most comfortable choosing an initial allocation of 60% equities, 40% bonds. As stock and bond prices change, these proportions will change as well. Rebalancing involves selling some of the asset class whose share is above the desired allocation and putting the money into the other asset class. From 1996 through 1999, annually rebalancing such a portfolio improved its return by 1 and 1/3 percentage points per year versus a strategy of making no changes." Mr. Malkiel is a professor of economics at Princeton University. This op-ed was adapted from the upcoming 10th edition of his book "A Random Walk Down Wall Street," out in December by W.W. Norton. http://online.wsj.com/article/SB10001424052748703848204575608623469465624.html