14. Types of Input Costs

The video begins by defining input costs as the expenses incurred to produce a good or service. Using an Uber driver as an example, fixed costs are identified as expenses that don't change with the amount of work, such as purchasing a car and car insurance. Variable costs, like gas and car wear and tear, fluctuate with the quantity of hours worked or production.

Total cost is explained as the sum of fixed costs and variable costs. Variable cost can be derived by subtracting fixed cost from total cost. The concept of average cost is introduced, which is the cost per unit, calculated by dividing total cost by quantity. Similarly, average fixed cost and average variable cost are defined.

Marginal cost is highlighted as a key economic concept, representing the cost of producing one additional unit. It is calculated by finding the difference in total cost between producing Q units and Q-1 units.

The video then demonstrates how to fill out a cost table. Fixed cost is identified as the total cost when the quantity produced is zero, and it remains constant regardless of production. Variable cost for each quantity is calculated by subtracting the fixed cost from the total cost at that quantity.

The process of calculating average total cost (total cost divided by quantity), average variable cost (variable cost divided by quantity), and average fixed cost (fixed cost divided by quantity) is shown. It's noted that average fixed cost decreases as quantity increases because the fixed cost is spread over more units.

Finally, the video illustrates how to calculate marginal cost for each unit. This is done by finding the difference in total cost between consecutive quantities. The pattern of marginal cost decreasing initially and then increasing is observed.