I don't know why you think that 1would produce 1
and 1
would produce 1
.
If you look at the details tab of the coinage (when it isn't buffed) you see it requires 4for 1
.
If you look at the details of the gold smelter (also not buffed) you see it requires 2for 1
.
So you need 8to produce 1
.
If you buff with(Aunt Irma's Basket) your output multiplies with 2, so that would make:
4for 2
2for 2
So you need 4to create 2