For those not in the know, what 2nddammit means is that as the Chinese Yuan falls in value it makes Chinese goods cheaper.  So, if we impose a 10% tariff, and the Yuan falls 4%, then the the cost on our side is only effectively up 6%.    Beyond that there are also changes in the underlying commodities in China.  For example, I deal in metals trading.  Because Chinese steel producers see a fall in demand (ie less U.S. buying), then the price of steel also falls, per supply and demand.  At some point the combined effect could theoretically cancel out the effect of the tariff, but we are far from that point.  Any me any question, this is my field.