In my opinion, about increase and decrease gold prices have many main factors because of the value of money. Firstly, US dollars are the main primary factors because if US dollars decrease, but other factors are standby gold prices will increase automatically because buying gold are the way to protect the risk of US dollars. This is some factor in a Global Market, but I will talk about the main factor of increase and decrease price of gold in Thailand. The primary, prices in a Global Market, this is the first facts because if prices are increased, but other factors are standby, the prices of gold in Thailand would be increased. On the other hand, if prices in the Global market are decreasing, gold prices in Thailand would be decreased too