That article seems to lump together divestment, which requires near unanimity of the market to be effective, and boycott, whose effects scale linearly with the

That article seems to lump together divestment, which requires near unanimity of the market to be effective, and boycott, whose effects scale linearly with the number of people participating. Divestment campaigns are problematic in that people have finite reserves of outrage and if they write a letter to the local university president urging divestment they're less likely to go on to write their state senator urging them to stop using private prisons.