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Why are small markets and big markets out of sync?

The reason for this situation lies in the composition of the large-cap index, that is to say, large-cap stocks account for a large proportion in the index and have greater influence on the index calculation than small-cap stocks. For example, if the index of large-cap stocks rises by one point, the index of small-cap stocks will rise below 0.5 or even more. Because its weight in the index composition is very small. That's basically it. I don't know if you can understand. If you don't understand anything, please contact me to discuss it.