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 made when copper is heated and mixed with tin, creating a stronger metal than copper. Date Event 3700 BC The Bronze Age (About 3700 BC to about 500 BC) The Bronze Age starts at different areas of the world at different times.The knowledge of how to mix the copper and tin moves slowly from place to place, plus many areas have no tin and/or copper to make the new metal.300 BC Europe (About 2300 BC) The Bronze Age starts about 2300 BC in Europe. Few tools are made in the beginning, but by 1200 BC bronze has replaced all stone tools. 2000 BC Britain (About 2000 BC) Bronze starts to be worked in Britain.