Assuming a set portfolio optimization problem, if all optimization inputs are kept constant, what would you expect, in terms of results, if you run the same optimization using the S&P500 as opposed to the S&P 1500, as a universe?
Intuitivelty, would you expect the strategy based on the S&P500 or S&P1500 to outperform?
Answer
Well, you are asking something very subjective. In addition it should be mentioned that S&P500 are the companies with higher capitalization of S&P1500. Therefore a huge weight of S&P1500 is set by S&P500. In fact, as it can be seen in 2008 both went down a 37%, in the other hand S&P500 has 80% of the total of the US equity Market.
After taking into account you should ask yourself a couple questions: What do I expect to perform better big caps, mid caps or small caps? And more important, is the 20% represented by mid and small caps going to out perform big caps?
If you buy a fund which tracks S&P1500 you can understand this investment as something similar to core-satellite investment, in which you invest 80% in the index and 20% in trying to outperform the index. If you consider that the risk of investing on this market is worth your expected growth, go for it.
In my opinion, regarding the actual economic situation, I won't take this option until,at least 2 years,until things change. I don't think that the economy will grow that much in 1-2 years time.
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