Yes, although that seems to match the Ask (Sell) price. Coinbase Pro also shows a single figure. I’ve just watched it for a few minutes and it usually matches either the buy or the sell price, although sometimes neither. I wonder if it shows the price of the most recent market order, either before or after it’s fulfilled. I guess you could say that’s the “actual price of the stock” or at least the most recent price so it’s likely that you were correct all along! Sorry!
Yes, that’s very much what Coinbase Pro looks like.
The next thing I need to understand is whether there is a single global order book for each stock or whether each exchange has its own. If the latter, are they completely independent, and if not, don’t the prices vary considerably?