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To rebalance or not to rebalance
Yes E[x] is expected value of x. E[x|y] = expected value of x, given y. c, k are some constants Let E[s_{n+1}|s_n=c] = c, but if  E[s_{n+1}|s_n,s_{n-1},...,s_{n-m}] ->some constant k as m->\infty (call this equation 1) then rebalancing makes sense. Notes: