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.
Bronze is usually made up of copper (about 90%) and tin (about 10%) Brass is usually made up of copper and zinc. Some alloys are called bronze when they are actually brass, suâ¦ch as commercial bronze which is made from copper and zinc.