The Highest Buy Price is visible to Sellers as the Sell Now Price.
Visible to everyone, but set by Buyers. Buyers can Make an Offer on any Phone at which point the price information is visible to everyone in View Bids and Asks, and the Orderbook. This means that anyone can adjust their offer real time to be the highest bidder if they want to increase their chances of their offer being accepted. If prices are lower on Doji than elsewhere and you can see that the number of units available is low, you might want to change tact and set the Highest Buy Price.