Neither criterion is a guarantee that the star shall have a measurable parallax.
Pleasure is nothing objective and objectively measurable: it is simply feeling pleased.
In the feeding experiments which have been carried on at Rothamsted it has been shown that the amount consumed both for a given live weight of animal within a given time, and for the production of a given amount of increase, is, as current food-stuffs go, measurable more by the amounts they contain of digestible and available non-nitrogenous constituents than by the amounts of the digestible and available nitrogenous constituents they supply.
If workers are in unsafe work environments, they are bearing a risk that has a measurable negative cost.
The various hypotheses, dogmas, proposals, as to the family, to capital, &c., are merely propositions measurable by considerations of utility and a balance of expediencies.