prices provide to both consumers and producers. A. incentives B. security C. assurence D. quantities​

Security

Explanation:

The producer knows he will definitely get his money and the consumer knows that they producer will always send his goods in to be sold as long as they keep selling

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation:

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live