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.
This word is applied to men, women and children, who are called natural persons. In law, man and person are not exactly synonymous terms. Any human being is a man, whether he be a member of society or not, whatever may be the rank he holds, or whatever may be his age, sex, &c.