Why must everything always be only one thing? Why not both? The decline in taxes and interest rates mechanically account for 1.8% points of the 5.4% net income

Why must everything always be only one thing? Why not both? The decline in taxes and interest rates mechanically account for 1.8% points of the 5.4% net income growth in the SP500 since 2004. This is not in dispute, unless you don't trust the numbers. Outsourcing and cost cutting account for some of the difference between sales growth (2%) and EBIT growth (3.6%), or 1.6% growth. Basically if you only sell a little bit more, but your costs go down, you can take home more earnings. But it's not a given that 100% of this 1.6% gap comes from sweatshops, there have been some legitimate reductions to cost of labor domestically, unless you think literally nothing has changed about productivity in the last 18 years. So sweatshops account for a maximum of 1.6% of returns, likely less, while taxes and cheap credit account for 1.8%. Outsourcing is not "the primary issue", mathematically.