Question $2(1$ point$)$

Kareem, a full time computer sciences student, is the owner of a $2020$ Toyota Corolla. Seeking to earn some cash to help with his expenses, he recently signed up as a driver with Uber.

Earlier this week, Katia used the Uber app to arrange a ride home from her dental appointment. Her driver was Kareem.

Whether they know it or not, both Kareem and Katia were participating in the$\_\_\_\_\_\_\_\_\_\_\_\_\_$ economy.