Input: Inputs are the various resources or factors of production that go into producing goods and services. Think of inputs like the different tools and utensils you need to use while baking a cake.
Productivity: Productivity refers to the efficiency with which inputs (factors of production) are utilized in the production process. It's similar to how efficiently you can use your time and resources while baking a cake.
Marginal product: Marginal product represents the additional output produced by using one more unit of input (factor of production). It's like adding one more egg to your cake batter and seeing how it affects the final result.