Question

why is pure competition considered an unsustainable system?
price differentiation is often too minimal to matter.
few barriers exist to entry, meaning that the market inevitably floods.
consumers cannot distinguish between products.
producers cannot make a profit if they keep dropping their prices.

Explanation:

In pure competition, there are many firms. If one firm drops prices (to maybe gain more market share), others follow. Continuously dropping prices erodes profit margins. Firms need to cover costs (fixed and variable). If prices go too low (below average total cost), producers can't make a profit. In the long - run, firms would exit the market (as they can't sustain losses), showing the unsustainability.

• Option A: Minimal price differentiation (products are homogeneous) is a characteristic but not the reason for unsustainability.
• Option B: Low entry barriers mean new firms can enter. But this alone (without the profit - price aspect) doesn't explain unsustainability.
• Option C: Consumers not distinguishing products (homogeneous products) is a feature of pure competition but not the cause of unsustainability.

Answer:

D. Producers cannot make a profit if they keep dropping their prices