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 - Technical information. 1  There are many different bronze alloys, but typically modern bronze is 88% copper and 12% tin. [14] 2  In the Bronze Age, two forms of bronze were commonly used: classic bronze, about 10% tin, was used in casting; and mild bronze, about 6% tin, was hammered from ingots to make sheets. Bladed weapons were mostly cast from classic bronze, while helmets and armor were hammered from mild bronze.