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Strange! The return is higher if I consider the slippage and commission ...

Normally I will set the following code in my codes:
... set_commission(commission.PerShare(cost = 0.0050, min_trade_cost = 0.0))
set_slippage(slippage.FixedSlippage(spread=0))
...

I thought the total return should lower than not considerung the slippage and commissions. But in fact it is the opposite.

Strange!