Jevons’s view is related to economics because the fiat currency system provides a more flexible form of trade than barter trade. Fiat currency is a government-designated banknote. For example, the United States recognizes that the US dollar is in its currency and is accepted as legal tender throughout the country and around the world. By using funds, the need for double coincidence is eliminated. The seller only needs to find the person who is willing to buy their product, and the buyer no longer needs to accurately sell what the original seller wants. For example, an artist selling an umbrella in the AmosWEB example might really need a new set of brushes. By accepting money, she is no longer limited to trading her umbrella, only those who provide paint brushes can get a return. She can use the money she gets from the umbrella stand to buy the brush she needs. One of the most important benefits of using funds is to save time. Taking the umbrella stand artist as an example, she no longer needs to use time to find these precisely matched trading partners. Instead, she can use this time to produce more umbrella stands or other products that feature her designs, thereby increasing her productivity. Economist Arnold Kling said that time also plays an important role in the value of money. Part of the reason for giving money value is that its value continues over time. For example, an umbrella artist does not need to immediately use the money she earns to buy a paint brush or anything else she might need or want. She can keep the money until she needs or wants to spend money, and its value should be basically the same.