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.
He dwarfs trees so that they remain measurable only by inches after their age has reached scores, even hundreds, of years, and the proportions of leaf, branch and stem are preserved with fidelity.
If workers are in unsafe work environments, they are bearing a risk that has a measurable negative cost.