When you give your broker that sell order, the default rule--meaning the one he'll use if you don't specify otherwise--is first in, first out.

FORBES: It Pays to Know Your Number

Just as they would impose a default rule requiring people to save money, while permitting them to "opt out, " employers could do the same for lunch.

BBC: Should lunch breaks be mandatory?

To encourage people to enjoy the benefits of lunch, we need to change the lunch default rule with the kind of "libertarian paternalism" advocated by Richard Thaler and Cass Sunstein in their book Nudge.

BBC: Should lunch breaks be mandatory?