Earlier quoted context omitted.
imo, it's in the best interest of the market for people to have to realize their gains otherwise the price of an item is pretty imaginary if it's never realized.
Gains are frequently not realizable as a matter of law and/or contract, for good reason. Additionally, there are many assets with notional value conditional on not liquidating them, which makes them de facto not realizable. And of course, the majority of assets have no liquidity, so realizability is a practical fiction. The unrealized values are a fiction. There is significant value in treating values as unknowable w…
Then instead of taxing the gains, you'd accept the government nationalizing the assets by eminent domain and paying fair compensation that was significantly less than the "fictional" unrealized value?
Or if someone unlawfully deprived you of the asset, you'd accept as restitution or seek as civil damages for the loss something significantly less than the "fictional" value?
Or, when it was no longer an excuse to avoid fair taxation, would that "fiction" suddenly be a lot more real to you?