 We can do more with decision theory utilizing purely practical or non-cognitive values. For example, there is a well-known, decision-theoretic, value-of-learning theorem, the Ramsey-Good theorem, which partially vindicates the value of gathering new information, and it does so in terms of “practical” values, without assuming any purely cognitive values. (Good 1967.) Suppose you have a choice to make, and you can either choose now, or choose after doing some experiment. Suppose further that you are rational (you always choose by expected value) and that the experiment is cost-free. It follows that performing the experiment and then choosing always has at least as much expected value as choosing without further ado. Further, doing the experiment has higher expected value if one possible outcome of the experiment would alter the relative values of some your options. So, you should do the experiment just in case the outcome of the experiment could make a difference to what you choose to do. Of course, the expected gain of doing the experiment has to be worth the expected cost. Not all information is worth pursuing when you have limited time and resources.