Your roommate is studying to be a chef and likes to try new recipes. He leaves his delicious creations in the refrigerator for anyone who wants to eat them. The food he leaves is always gone within a day. This is an example of:

a positive externality

Explanation:

A positive externality is said to occur when a good or service that is produced or consumed by an individual for his benefits, also benefits another third party.

In the scenario sited in the question above about my roommate, his trying of new recipes does not only help him in his pursuit of being a good chef, but also serves as a benefit to other people who eat his delicious creations he left available in the fridge to anyone to have access to. This is an example of a positive externality.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.  

answer; sensory craving;