The document discusses the Jones Act, which regulates domestic maritime shipping in the US. It summarizes arguments that the Heritage Foundation and others have made claiming the Jones Act increases shipping costs. However, the document argues these claims are not substantiated and ignores market factors like supply and demand that actually drive shipping rates. Backtesting of shipping routes and costs between the US Gulf Coast and East Coast do not show a significant difference in rates between Jones Act and foreign-flagged vessels. The economics of supply and demand in the US-flagged tanker market, including the limited fleet size, help explain current rate levels.