Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make money in commodities [title] Understand physical commodity transactions. [step] Commodities are raw materials, agricultural products, petroleum products, and industrial and precious metals. Physical commodities are bought and sold in bulk for immediate delivery in specialized markets around the world.

Ending1: These markets are known as the " spot " or " cash " market. The majority of participants in the spot market are producers, and users of the commodity, able to finance and store large amounts of a commodity such as a refinery buying crude oil or a flour miller buying wheat and corn. Ending2: Building their opinions on a given topic, describing an industry in a simpler way, and engaging in local businesses as well. [substeps] In many countries, commodity has been paid off. Ending3: Commodities are usually sold at high prices over the course of the year, so their ranking in industry trees, decades ago, has tied them to the ongoing profitable sector. However, once this crisis passes, commodity prices may drop rapidly and tend to fall. Ending4: They may cost free for individual or insured individual employees, and they may cost more than the free price for companies in one industry. The gross sum of the commodities being sold are : [substeps] Mining goods.

Answer format: ending1/ending2/ending3/ending4