What role does self-interest play in a market economy

In a market economy, individuals and businesses own most of the resources available (e.g., labor, land, and capital) and use voluntary decisions, made in their own self-interest, to achieve the greatest personal benefit from marketplace activities and transactions.

Explanation:

can you give more details

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.