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A number of carriers have more than a dozen tariff code in their Economy only. Most of the times, what you see is not a modification of prices, but a modification of the available tariffs. They can see a $300 ticket rate in one minute, and in the next Minute the minimum ticket rate is $400.
This $400 rate was always there, but since most folks are looking for the cheapest rate, they would not see the $400 rate unless it was the cheapest rate at the point of the look. That $300 ticket you saw before still lives, it's just not on offer yet. It may be because someone has purchased the last available ticket with this tariff or because the airline's price finding algorithm has determined that they no longer need to resell the cheaper tariff for some other reasons.
This $300 rate may reappear if there are not enough places sold for a few nights when the carrier offers it for resale. EDIT: Why should you want to buy a tariff scheme, especially one that is not the best? This is because different tariffcodes normally have different authorisations. when I buy a ticket.
It would surprise most of us how often two ticket numbers appear for exactly the same cost. When you are looking for the lowest priced ticket, you will always see the least favored tariff information, but if the rate is the same (or only $1 - $5 different), I always buy the "higher" tariff information.
This brings me before anyone who pays the same amount (or very near to it) for a less cheap piece of software.... for updates, not being pushed, etc...