2. Seasonal factors of products: for example, agricultural products and seafood have their own production seasons, and once the production period is over, the price will drop, and vice versa;
3. Data published by international countries: For example, crude oil includes EIA and the Organization of Petroleum Exporting Countries, and their publication directly affects the price of crude oil;
4. Impact of unexpected events: For example, the US military strike against Middle East countries led to the rise of gold and oil prices.