The document describes several trade finance instruments: cash in advance, letters of credit, documentary collections, bank guarantees, bills of exchange. It provides details on each: cash in advance avoids credit risk but is least attractive to buyers; letters of credit provide secure payment if terms are met; documentary collections use banks to collect payment in exchange for documents; bank guarantees ensure debt payments if the debtor fails; bills of exchange are written orders to pay a fixed sum at a future date. It also compares letters of credit to bank guarantees, noting letters of credit transfer funds after conditions are met while bank guarantees only pay if the opposing party does not meet obligations.