Judging the selection result with the maximum and minimum regret values.

Sell well, generally sell poorly.

Self-research scheme 500 300 100

Patent purchase plan

Regret value in natural state

Self-developed scheme 300 200 0

Patent purchase plan 0 0 400

Maximum regret value of self-developed scheme: 300.

The biggest regret of purchasing a patent scheme is: 400.

After comparison, the self-developed scheme has the least regret, so the self-developed scheme is chosen.