Katie is weighing several job offers. She gives each job a score on several criteria, then sums the scores. Katie is using the approach to make her decision.

Explanation:

In the additive feature model we take into account all the important features of possible choices and evaluate each option.  It is useful while making complex decisions.  

It is the most effective way to choose an option from variety of options available to us. It is time consuming so is ineffective when we need to make decision in short period of time.

Since Katie has to choose one job out of the choices available to her, she is using Additive Feature model.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.