Characteristics of the U.S. Economy
Flappy Bird was an off the charts app. While the demand for the game was still rising the app was taken down form the App Store. Not much later did apps like Splashy Fish, Flappy Doge, Flying Cyrus, and Tappy Bieber. This is an example of Consumer Sovereignty. When there was no supply to fulfill the demand they made more apps. The demand drove production.
This image represents that the economy has competition. Rivalry between many different stores. They all sell jeans and shirts and all strive to sell the best products for the least.
This Gif shows voluntary exchange. We have the opportunity to shop and buy whatever we want. We can choose what stores and brands to buy from.