Explanation:

- Open sale: This refers to a sale where the goods are offered to any buyer; prices can fluctuate based on demand and supply.

- Cash sale: In this scenario, the buyer pays for the goods immediately. It doesn’t necessarily depend on the timing of the harvest.

- Distress sale: This occurs when farmers must sell their produce urgently after harvest, often at low prices, due to financial pressures or lack of storage.

- Credit sale: This is when the sale is made on credit, allowing the buyer to pay at a later date.