The taxicab drivers' union is threatened by the introduction of self-driving vehicles. This is an example of which of the 5 forces? a. Power of buyers b. Threat of substitutes c. Power of suppliers d. Threat of new entrants e. Rivalry of existing competitorsWhich of the following would NOT be considered an industry's barrier to entry? a. High customer switching costs b. Strong economies of scale enjoyed by current industry members c. Strong demand-side benefits of scale d. Relatively low capital requirements