Answer:
to minimize their opportunity cost.
Step-by-step explanation:
Comparative advantage refer to the ability from Peter to produce goods an services at a lower opportunity cost than others.
We must remember that opportunity cost is the best rejected alternative for a given factor.
In this case Peter labor force can have three possible returns.
If is picks to work as custodian or teaching it will renounce to work as a telemarketer for $10 dollars per hours (best alternative in both cases) Thus it will lose a dollar or even two dollars per hours fro man economic point of view
While working as a telemarketer makes his renounce to a 9 dollars salary (best alternative rejected) Thus it will achieve an econmic gain of 1 dollar per hour.
The potential benefit loss working as telemarketer is less than in the other jobs. It forfeited to less amounts of wages thus; it is comparative advantageous for him to work as telemarketer.