Which of the following could not prevent a market from becoming perfectly competitive?

excessive information

problems accessing necessary technology

high start-up costs

lack of technological know-how

The answer is excessive information.

Explanation:

Excessive information is the only option in the question that does not lead to a market from becoming perfectly competitive. If anything, lack of information on how to enter the market creates this problem - since business firms would have difficulties entering the market if they don't know how to get the needed products or how to acquire the market segment. High start-up costs, lack of technological know-how, and problems accessing necessary technology, on the other hand, might lead a market to become more monopolistic, or even an oligopoly.