I don’t think this is the right question to ask. Even if the net alertness gain of a cup of coffee is 0, it is still worth consuming during those moments that alertness is worth more, and abstaining during those moments where relaxation is worth more. Net alertness is not net EV.
There are different ways to consume caffeine. A lot of people consume caffeine as part of their morning routine. It’s useful to know whether or not that increases productivity even when there are also other ways to consume caffeine.
I don’t think this is the right question to ask. Even if the net alertness gain of a cup of coffee is 0, it is still worth consuming during those moments that alertness is worth more, and abstaining during those moments where relaxation is worth more. Net alertness is not net EV.
There are different ways to consume caffeine. A lot of people consume caffeine as part of their morning routine. It’s useful to know whether or not that increases productivity even when there are also other ways to consume caffeine.