Question

tell me why iron is low price and gold is high price while both are metal

Answer 1

the greater the demand and the less the amt of it to be had the higher price shall go

Answer 2

the difference between them is that iron is widely available whereas gold is rare the demand of gold is more . by the law of demand and supply, if supply is less and demand is more than the price of things increases. like gold.
Hope this answer helps