Glen found three brands of earbuds that have the specifications he wants. the three pairs of earbuds looked a bit different from each other, but glen knew they would perform similarly. still, each company offered its earbuds at a different price. what economic concept does this situation represent? collusion product differentiation price-fixing natural monopoly

Product differentiation is the economic concept that this situation represent.

Product differentiation is a marketing process in which firms differentiates their products or services from the others in order to make it to be considered valuable and more attractive to a certain target market. A firm differentiates a product from competitors' products and also from the firm's other products. Products are differentiated from the others in terms of price, brand names, quality, product’s design and benefits.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.