Portfolio rebalancing
December 4, 2018
Financial portfolio theory has the idea that owning too much of a particular stock is bad as it exposes you to greater company-specific risk, which unlike systemic risk is not generally compensated for by higher returns (assuming investors are demanding proper risk premiums etc.) This leaves room for a particular kind of human error: you have to sell things which are doing well, as they come to represent a greater proportion of your portfolio that is optimal. This is emotionally difficult.
