Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is unrealized gain part of asset?
There's an expression, "stock prices have no memory." Apple trades at about $115. Why would I carry my shares at anything but $115 even though I paid say $75 a share, while you just bought it at $115?  The only difference, perhaps, is that if I hold them in a non retirement account, I might track the net I'd have, post tax.