Jeffrey decided he could cam a nice profit by developing courses and offering one$-$on$-$one belp to older customers in overooming their technology deficiencies. Although the business strugglod at first, he is experiencing a good deal of success now. Jeffrey has many satisfied customers, and the business has grown to the point where he now employs several workers. Jeffrey's experience is an example of

A$)$ the invisible hand coocept.

sacialism at work.

resouroe developmert.

the principle of comparative advantage.