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.
All of these words are nouns, words that identify the whos, wheres, and whats in language. Nouns name people, places, and things. Read the sentence that follows: George and Godzilla walked to Antonio's to order a large pepperoni pizza. George is a person.