"It's Down 20%, So It's Cheaper Now" — No, It Isn't

There’s a phrase that trips up nearly every new options trader: it’s down 20%, so it’s cheaper now. That logic works perfectly well for a shirt on a clearance rack. It does not really work for an option.

The shirt didn’t change. The option did.

When a store marks a shirt down, the shirt is identical — only the price tag moved. An option is different: it’s a wasting asset. When its price drops, that’s usually because the actual value of the contract decayed, not because the market is suddenly feeling generous.

Three forces push that price down, and none of them are doing you a favor:

• Directional move — a call loses value when the stock falls; a put loses value when the stock rises.
• Time decay (theta) — the option loses value every single day as expiration approaches, even if the stock doesn’t move a cent. That loss doesn’t come back.
• IV crush — once the market stops expecting drama (classically, right after earnings), the “insurance premium” baked into the option shrinks fast, even if the stock barely budged.

The trap hiding inside “cheap”

Buying an option purely because it dropped 50% is one of the most reliable ways beginners lose money. Two things are usually happening underneath that discount:

• Out-of-the-money decay — if a stock sits at $100 and you’re holding a $110 call, and the stock just… stays at $100, your option is drifting toward a −100% outcome no matter how cheap it looked along the way.
• Liquidity illusion — sometimes the “big drop” is really just a wide bid-ask spread. The last traded price was from a different, more optimistic moment; it isn’t what anyone is actually willing to pay right now.

	A store discount	An option’s negative %
Reason	Promotion	Lost time value, adverse move, or IV crush
Quality	Identical product	Often a lower probability of profiting
Time	Limited-time offer	Value is disappearing continuously

A falling percentage means you’re spending less cash than the person who bought yesterday. It does not mean you’re getting a better deal — you may just be buying a contract with worse odds at a lower price. Cheap and good are not the same thing in options, and the sooner that distinction feels automatic, the fewer “why did this go to zero” moments you’ll have.