Supply AND Demand for Labor

Commenting on my pro-immigration stance, whiskeyJim says:

Illegal aliens hurt the working poor, despite any Cato study. It is a simple supply and demand issue regarding unskilled labor.

whiskeyJim's claim reflects an incomplete picture of reality.

It's true that, all else unchanged, an increased supply of unskilled workers will drive down the wages of unskilled workers.  But when analyzing immigration's full effects, the "all else unchanged" proviso blinds us to the most important consequences o...