The CPI takes a constant basket of goods and sees how the price changes from year to year. If the price of the basket of goods increases, then there is price inflation. If the price of the basket of goods decreases, then there is deflation.
Copper and tin mainly make up bronze but other elements include phosphorus, manganese, silicon and aluminium.
Generally, bronze is considered as a copper- tin alloy. Also, copper aluminum alloys and copper silicon alloys are called bronze. Bronze can also be classified based on other alloying elements. Lead, Zinc, Phosphorous, Aluminum, Silicon, and Silver are the additional alloying elements.