This sentence reflects a socially constructed truth (or falsehood) insofar as we have to agree on what the symbol XYZ stands for, what a currency is (is bitcoin a currency, are apples -- depends on the context) and what criteria of stability we have.
We can measure the exchange rate of a currency compared to others and we can define criteria for what we call stability in this context -- and we can make propositions based on that model, but only if we agree on the model. But all of that comes down to our socially constructed definitions. We cannot objectively measure the value of a currency like we measure the wavelength of a photon.
Other examples: "A Tough stance on crime works" (or has a lower crime rate other possible explanations). "Tomorrow there will be a traffic jam on intersection XYZ" (or won't there be a traffic jam because people assume that there will be and avoid that intersection).