I want to share something with you that might help if you're managing a business or interested in studying cost management—that is, distinguishing between fixed costs and variable costs, because these two are clearly different.

Let's start with variable costs because they change according to the situation. Variable costs are expenses that increase or decrease based on the level of production or sales. If you produce more, variable costs go up; if you produce less, they decrease accordingly.

If you want to know what variable costs are, I'll give you some examples. For instance, raw materials used to make products—more products mean more raw materials. Direct labor wages—if more workers help with production, wages increase. Packaging costs, transportation fees, sales commissions—all of these are variable costs because they depend on how much you sell.

In contrast, fixed costs do not change regardless of how much you produce or sell. Rent for land or office buildings must be paid every month whether the business makes a profit or incurs a loss. Salaries for permanent staff, insurance, depreciation of machinery, loan interest—all of these are fixed costs.

The importance of this is that if you understand the difference between these two types of costs, you can set reasonable prices for your products. This ensures that the price covers all costs and still yields a profit. Once you know what variable costs are and how much they are, you can calculate the total cost more accurately.

Another good point is that variable costs offer more flexibility because if the market weakens, you can reduce production, and variable costs will decrease accordingly. Fixed costs, however, remain the same. Therefore, good management must consider both.

When you combine fixed and variable costs, you get the total cost, which is crucial information for deciding whether to invest in new machinery or hire more staff. For example, if labor costs are very high, some companies decide to invest in machinery instead, which shifts high variable costs into more stable fixed costs.

In summary, understanding what constitutes variable costs and fixed costs is a fundamental basis for business management. Whether it's planning production, setting prices, or making investment decisions, this knowledge helps ensure your business remains stable and competitive in the long run.