I believe that you are assuming that the daily Forex Trade numbers, are the annualized ones. The volume on a per day basis is 6.6 trillion. Multiply that by 365 and you’ll have 2,409 trillion dollars worth of volume traded on an annualized basis.

Since the average fee applied to these trades is 2%, then that means on an annualized basis the world economy is losing roughly 48.2 trillion annualized since 2% of the annualized forex trades works out to this number.

Now assuming that the blockchain can plummet the fee rate by 90% which it definitely can and has done in many exchanges already, you are looking at annualized savings of at least 40 trillion.

Does that clear up the confusion?