0ne of the best ways to avoid injury while biking is to

Wear knee pads to prevent knee injury

Wear a protection like helmet

In a market economy, supply and demand determine prices and prices, in turn, allocate the economy's scarce resources.

Supply and demand are the driving forces of prices in our economy. If there is a high demand the prices will reflect and likewise if the opposite. Understanding this concept helps us to determine why certain items are priced at the price point they are.