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.
Brass is a metal that consists of both copper and zinc. Bronze is a metal that consists of copper and tin. Bronze is the most popular metal for cast metal sculptures or bronze sculptures. Common bronze alloys often have the unusual and very desirable property of expanding slightly just before they set, thus filling the finest details of a mold.