Anderson, a City Employee, Collected Garbage Along Smyth's Street on Thursday

True/False

Anderson, a city employee, collected garbage along Smyth's street on Thursday of each week. One day Smyth said to Anderson: "You have done such a good job; I will give you $10 when you come by next week." The next week, when Anderson made his regular garbage pickup for the city, he met Smyth and asked for the $10. Smyth refused to pay. Smyth is not obliged to pay Anderson the $10, because his promise was gratuitous.