amqata

I think Schweser does not say anything about the Laffer curve. It's not a particular LOS but there is an EOC on it, in reading 26. It's not worth looking up, all you need to know is this: The Laffer curve illustrates the relationship between the tax rate and tax revenue.
That's all they can ask about it because they do not discuss it in depth or anything, it's on page 437, book 2.