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None of what follows is fraud. These are ordinary, widely used techniques, and knowing them is most of what it takes to stop falling for them.
The reference price
"Was $200, now $120." The saving depends entirely on what the $200 means. It might be a price the item genuinely sold at for months. It might be a price it held briefly, or a manufacturer's suggested figure that no shop ever charged.
In the European Union this is now regulated directly. Article 6a of the price indication directive requires that "any announcement of a price reduction shall indicate the prior price applied by the trader for a determined period of time prior to the application of the price reduction", and defines that prior price as "the lowest price applied by the trader during a period of time not shorter than 30 days" before the reduction. So an EU seller advertising a discount is supposed to be measuring it against the lowest price of the previous month, not against whatever number flatters the offer.
Outside the EU the rules vary, and enforcement varies everywhere.
What to do: check the price history if you can, or just check two other sellers. The real reference price is what someone else will sell it to you for today.
Anchoring
Put an expensive option next to a mid-priced one and the mid-priced one looks reasonable. The expensive option does not need to sell; it just needs to be there. This is why the three-tier pricing table is everywhere.
What to do: decide what you need before you look at the options, not after.
Manufactured urgency
Countdown timers that reset, "only 3 left" counters that are not connected to stock, and sales that end and then quietly return. Urgency works because it prevents comparison, which is exactly the thing that would have changed your mind.
What to do: if a deal cannot survive you sleeping on it, it was not one.
Drip pricing
The headline price is real, and then delivery, service fees, booking fees and insurance arrive one screen at a time. Each addition feels small relative to the commitment you have already made.
This is where disclosure rules matter. US Federal Trade Commission guidance on digital advertising is explicit that a disclosure must be close to the claim it qualifies and prominent enough that people actually notice it — the test is whether the information is genuinely conveyed, not whether it technically appeared somewhere. A fee revealed only on the final screen fails that test in spirit even where it survives it in law.
What to do: compare the final checkout total, not the advertised price. This is the single habit that saves the most money, and it takes an extra minute.
Shrinkflation
The price stays the same; the pack gets smaller. It is not a discount technique, but it defeats price memory, which is what you were relying on to judge whether the price is fair.
What to do: compare per unit, not per pack. Which is what the calculator on this site is for.
The honest summary
You are not going to out-think every pricing technique, and you do not need to. Two habits cover most of it: compare the final total across at least two sellers, and never buy something urgent on the day you first saw it.