exchange of contracts vs payment

exchange of contracts

noun
  • The act of exchanging contracts. 

  • The point or stage at which a conveyancing contract comes into existence between negotiating parties for the carrying out of a disposition of an estate in land; usually requiring the payment of a deposit. 

payment

noun
  • An instance of that act; a sum of money paid in exchange for goods or services, or the transaction that conveys it. 

  • Antonyms: non-payment, nonpayment 

  • The act of paying. 

How often have the words exchange of contracts and payment occurred in a corpus of books? (source: Google Ngram Viewer )