money's worth
/ˈmʌnɪz wəːθ/(also money's-worth, moneysworth)
noun
1Something that is worth money or is recognized as equivalent to money. Frequently in money or money's-worth.
2An equivalent for the sum of money paid or to be paid; (full) value for one's money. Now chiefly with possessive adjective, especially in to get one's money's worth.
Origin
Late 16th century. From the genitive of money + worth.