But why would it be bitcoin? Again, the price that I'm asked to pay for that frozen pizza might be shown to me, in bitcoin units, but looking forward a decade from now, nonetheless three decades, perhaps that amount of bitcoin presented to me is computed in real time based on a basket of components -- all used to compute in real-time the price the grocer is willing to sell a frozen pizza to me.

Why might a grocer go through all this just to establish the price to charge for a frozen pizza? Because my offer to buy a frozen pizza might get routed to a number of grocers, and my shopping concierge app will find the grocer selling at the best price, considering, of course, the cost for transport from that grocer to my house (performed by Tesla's automated fleet of autonomous delivery wagons).

So in that instance, that grocer is setting the price of the pizza based on the cost from the supplier to restock that pizza, the cost of the grocer's labor that day, the cost of electricity (for keeping the inventory refrigerated), the cost of building's lease, etc. All those might be presented in bitcoin using "just in time" / spot price but the amounts will be based on the underlying components, and will fluctuate in price -- whether they are communicated in bitcoin, or dollars, or other commodity currency even (barrels of oil).

But it will all happen behind the scenes by software. So I think your list of answers to the question needs another option -- either "never" or "invalid question".