A. Which of the following statements is correct regarding entry barriers?
Entry barriers exist in all market structures.
b. Entry barriers exist in perfect competition and monopolistically competitive markets.
c. Entry barriers do not exist in any market structures.
d. Entry barriers exist in monopoly and oligopoly markets.
e. Entry barriers exist in monopoly and monopolistically competitive markets.

Kate is 14 years old and just started taking dance classes with her friends at a local dance studio. this is her first time in a dance program, so everything is new to her. her friends convinced her to join the class since they have been enjoying it for a few months. how could the following terms her succeed in the dance class? ● secondary reinforcement ● identity vs. role confusion ● observational learning how could the following terms hinder her success in the class? ● circadian rhythm ● basal ganglia ● vestibular sense