[jamesaguilar]

Which other relatively long or expensive wars are missing from this?

Wouldn't the length of a war be difficult to estimate at the outset, and hence be priced in to stock market growth over time? In my economics class they taught us that war is bad for the (real) economy because the country is relatively more invested in the engines of destruction than production, and thus productivity growth in things that make life better is lower. The conclusions of this chart stand to intuitive reason based on that teaching, but I'm by no means an expert.

[burgerbrain]

Korea.

But to be fair, Korea was dwarfed by WWII and Vietnam in cost and public awareness. For example, did you know that we're currently technically still at war with North Korea? There's only a cease-fire, no treaty. We still even have troops over there...