please. opportunity loss is not a "cost" in the sense most people understand.

> Bromley, who died in 1990, also invented curtains that automatically closed when the sun went down.

Today such an 'inventor' would be called a tinkerer or hacker.

> that cost its inventor millions

I figured he had been sued for patent infringement or something. This must be written by someone who buys things at a discount and then believe the difference is an income she has earned and not buying it is a loss.