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.
A bronze is an alloy of copper and other metals, most often tin, but also aluminium and silicon. 1  Aluminium bronzes are alloys of copper and aluminium.2  The content of aluminium ranges mostly between 5-11%. 3  Iron, nickel, manganese and silicon are sometimes added. bronze is an alloy of copper and other metals, most often tin, but also aluminium and silicon. 1  Aluminium bronzes are alloys of copper and aluminium. 2  Bell metal. 3  Phosphor bronze. 4  Nickel bronzes, e.g. nickel silver and cupronickel. 5  Speculum metal. 6  UNS C69100.