By Matt Levine, Bloomberg, May 10, 2018
What should you do, as a shareholder, if you think guns are bad? Well, you could buy shares in big retailers and then encourage those retailers not to sell guns. You could buy shares in banks and encourage them not to finance gun manufacturers. You could refuse to buy shares in gun manufacturers, thereby driving up those manufacturers’ cost of capital and reducing the production of guns. These all seem like plausible, though incremental, approaches.