Select the correct answer from each drop-down menu. According to
, self-interest and competition act as
guiding firms in a market-based economy.

Adam Smith; an invisible hand.

Explanation:

According to Adam Smith, self-interest and competition act as an invisible hand guiding firms in a market-based economy.

Generally, different sellers have various reasons for the sales of their products but it is fundamentally based on self-interest and competition among others.