There are times when you should request copies of your records: 1  Permanent Change of Station. 2  Deploying. 3  Retiring.
0. EXPERT ANSWER. Double coincidence of wants refers to a situation in a barter system where the goods or services offered by a seller are exactly the same as that required by a buyer and vice versa.
Definition of Double. When a number is multiplied by 2, we say that it is doubled. John has 4 candies. `Tom has double the candies as many as John has` implies that Tom has 2 Ã 4 = 8 candies.