The market opportunity slide is the pitch-deck slide that sizes the market a startup is going after, ideally with a bottom-up customer-by-price calculation. It typically uses the TAM/SAM/SOM framework (Total Addressable Market, Serviceable Addressable Market, Serviceable Obtainable Market) and is ideally calculated bottom-up (number of potential customers multiplied by realistic price multiplied by addressable share) rather than top-down ("this market is $X billion and we'll capture Y percent"). It is the slide where investors trust the analysis more than the headline number, and the slide where founders most consistently lose credibility by quoting analyst-firm market sizes that everyone in the room knows are inflated.
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