How to create a Yahoo mail account Yahoo Mail is an email service that was first introduced in 1997. Yahoo Mail is a free web-based email service that allows you to communicate quickly. With a Yahoo account, you can access all of Yahoo's services. Yahoo Mail lets users pick how...

Opportunity cost is the potential benefit of an alternative opportunity that must be sacrificed when choosing a specific action. In other words, opportunity cost measures the cost of giving up one opportunity to take another. For example, if you want to buy a new car, you need to give up...