In contrast to the classical cost (labor) theory of value, the so-called marginal revolution ushered in the modern, subjective theory, whereby market price is determined by the marginal utility of a good.
The foundational assumption behind the gun control narrative is that only government law enforcement agencies should have guns and that we should trust police to keep us "safe." That narrative is failing.
Arguments over the gold standard are not merely technical disagreements. Rather, the gold standard often serves as a proxy for “sound money,” which was a central element in the classical liberal tradition of limiting government’s ability to wreak havoc on society.