Is the Price of a Ride Variable Over Time?

I noticed that like on different days The prices are different right like the price of the ticket is different Do you know if that changes over time? No, I mean like so let's say I want to go on friday march 15th right over. So it didn't used to it used to be fixed And I know they've been changing like the pricing system has changed in the past couple years and so it's possible that now it's variable. It used to be that like that date was always going to be that price once it was posted at that price But I'm not sure anymore if that's still true.