Surely you didn't expect us to let that logic fallacy slide in order to support your argument.

A butterfly flapping its wings doesn't cause a tornado anywhere, because tornadoes come from disturbances in layers throughout the atmosphere and is related to converging supercells and the meeting of hot and cold air.

Likewise, a change in the price of goods in one city or even one small town isn't likely to have a huge impact, if any, on the total economy, except for that of the immediate area. And even then, a change in price is not the sole factor in determining the direction of the economy. Other factors, such as the individual buying power of consumers, the cost of living, consumer confidence in future earnings and many other factors contribute to condition of economics.

The biggest reason why economic forecasters fail is because they only consider economics from the standpoint of your typical economic player: a white man or woman with a few kids, a portfolio, a house, a car, a job and loads of money. They don't consider other people, such as those who are lifelong pennypinchers, the person who saves more of their paycheck than spending it, the people who eschew consumerism, and other anomalies or outliers.