On average, each $1 billion of construction spending results in about 6,000 full-time one-year equivalent construction jobs and roughly another 6,000 non-construction jobs. Naturally, different types of construction create different employment numbers. That said, assuming the wall costs $21 billion, it will create 125,000 construction jobs and 125,000 non-construction jobs. That’s 250,000 jobs! The economy only creates 2.1 million/year. Were it to happen, it would be massive.