Which of the following industries is least likely to exhibit the characteristic of free entry?

Over the next few years more and more people prefer to ride on scooters. Which of the figures above best illustrates how this change affects the demand curve for scooters?

A) Figure A B) Figure B C) Figure C D) Figure D E) None of the above answers is correct because the change in tastes will affect the supply curve not the demand curve.

What is the difference between the optimizing strategies used in an English auction and a Dutch auction?

What will be an ideal response?