If a lumberjack cuts down a tree and sells it to a carpenter, and the carpenter makes a rocking chair and sells it to Home Depot, and Home Depot sells it to a hipster who wants a rocking chair on his 4′ x 6′ apartment patio, the only sale counted in GDP is that final sale. It’s counted in “consumer spending”, which makes up ~67% of total GDP. If the carpenter had sold it to Cracker Barrel, it would have been counted in “business investment” (~18% of GDP). Who remembers the equation and what is coming next? C+I+G+(x-m)=GDP. If the Bureau of Economic Analysis bought the chair for their waiting room, it would be counted in “government spending” (~17% of GDP). And, finally, if Kim Jong Un bought the rocking chair for the DMZ, it would be counted in exports (~-5% of GDP; we import more than we export). Simple enough, right?