Learn Finnish: Hän osti television kulutusluotolla. - He bought the television on consumer credit.

The transaction adessive (-lla/-llä) doesn't just cover the numeric price; it also covers the financial instrument used to pay. Just as you can buy a car for five grand (viidellä tonnilla), you can buy it on credit (luotolla), with a loan (lainalla), or with cash (käteisellä).

What are the parts of the compound word kulutusluotto?

It combines kulutus (consumption) and luotto (credit or trust). The first part comes from the verb kuluttaa (to consume, spend, or wear out), making kulutusluotto the exact term for consumer credit.

Why is television in the accusative case (ending in -n) rather than the partitive?

The -n ending marks it as a total object. The action of buying (osti) is complete, and the entire television was purchased. If the sentence were negative (he didn't buy it) or the action was ongoing, you would use the partitive case (televisiota).

Could I say lainalla instead of luotolla in this sentence?

You could, but they mean slightly different things. Laina is a standard loan (usually cash borrowed from a bank), whereas luotto refers to credit. Buying a TV kulutusluotolla implies using a financing plan, store credit, or a credit card specifically meant for consumer goods.