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 a durable material that ages well. Bronze is a metal alloy produced by blending copper and tin. It can contain between 2% and 20% tin. Other metals, such as iron or pewter, can also be blended with bronze to make them sturdier or to change their color. It is a sturdy, durable metal and is much harder than brass.