Andrew Su, CEO at brokerage Compass Global Markets said the average cost of producing gold in Australia, home to some of the world's biggest gold miners, has jumped from $500 an ounce in 2007 to over $1,000 an ounce this year.
Persons (plural) is a very formal word. We only use it in rather legalistic contexts: [notice in a lift] Any person or persons found in possession of illegal substances will be prosecuted.
You usually say one person but two people, three people, four people. This is to say that people is the plural of person. However, persons can be used as the plural in formal or legal language. e.g. Persons with neck problems. Persons who wish to adopt a child may contact us.