Whenever I need to translate the English word 'scarcity' into Tagalog, the first word I reach for is 'kakulangan'. In my head 'kakulangan' sits neatly as the go-to noun — it covers shortages of money, supplies, time, or skills. For example: 'May kakulangan sa suplay ng bigas sa bayan namin' (There is a scarcity in the rice supply in our town) or 'Kakulangan ng oras ang dahilan kung bakit hindi natapos ang proyekto' (A scarcity of time is why the project wasn’t finished). Grammatically it's straightforward: pair 'kakulangan' with 'ng' or 'sa' to specify what is scarce.
For more casual or spoken Tagalog I often use 'kulang' and 'kapos'. If someone says 'Kulang ako sa tulog' it means 'I'm short on sleep' — that's using 'kulang' as an adjective. 'Kapos' has a slightly older or more literary vibe: 'Kapos sa pera' translates to 'lacking money' and you hear it in news reports or novels as well. Another useful term is 'kakaunti' (meaning 'very few' or 'there are only a few left'): 'Kakaunti na lang ang nalalabing ticket' (There are only a few tickets left).
If you want to be specific about supply-chain or economic scarcity, say 'kakulangan sa suplay' or 'kakulangan sa pondo' (scarcity of funds). For more abstract uses — like scarcity mindset — you can say 'pag-iisip ng kakulangan' or describe someone as 'laging nagpapalagay ng kakulangan'. I find playing with these shades makes Tagalog really expressive; it can sound formal, urgent, or casual depending on the word you pick.