Studying the way people change and the way they stay the same throughout the life span would be defined as . (Note: your text discusses the changes of growth and decline, but I always include the possibility of staying the same as well.)

human development

Explanation:

Human development refers to the process of enhancing the freedoms and possibilities of people and working to improve their well-being. It is about the real independence that ordinary people have in deciding what they want to do, and how they want to live their life. It provides people the opportunity to lead a life they value. In other words, improving people's capabilities and allowing them opportunities to use them.

this is an outline for the decisions that frankie is going to make

opportunity cost

willingness to buy

price or quality

of course, there could be many economic strategies that should be considered important while making decision. opportunity cost is the foremost significant factor while considering any economic option. when you buy something, you should know how much you are forgoing for this product. indeed, you could buy something different with this measure if you changed your mind. willingness to buy shows how much surplus you are earning while making a decision. it is important because it shows you buy what you want or you buy because you have only limited amount of money. the price or quality can be considered as a general economic option that we are applying while buying something. when you buy something, price or quality could be one of the options. indeed, they define the characteristics of the product.    

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