DrinkSomeone buying a cup before work, nearly every day

When I buy a cup nearly every day, I want to keep the habit affordable, so I do not have to give up a small thing I genuinely like.

Khi tôi mua một ly gần như mỗi ngày, tôi muốn giữ được thói quen đó trong tầm tiền, để không phải bỏ hẳn một thứ nhỏ mà mình thật sự thích.

Job context

Each cup is too cheap to think about
High
Only the year's total is meaningful.
Root cause: A small repeated expense triggers no deliberation at all
Loyalty cards bring you back more often
Medium
Buying more to reach the free cup.
Root cause: Reward thresholds sit above the natural buying rhythm
Making it at home does not last
Medium
A few weeks and the old pattern returns.
Root cause: What is bought is not only the drink but the walk away from the desk
Prices rise without anyone noticing
Medium
A little at a time.
Root cause: Increases fall below the threshold of notice
Quitting means losing something enjoyed
Medium
For a saving that changes nothing.
Root cause: Cutting always targets the smallest, most visible items

A solution is not the same thing as a product, a customer can hire a behaviour or a workaround too.

Set a weekly cup limit
Behaviour
Simple and effective, sustained by willpower and nothing else.
Buy a monthly subscription from the shop
Product
Predictable cost, encouraging more cups to justify it.
Make it at home some days
Behaviour
A clear saving, losing the break itself.
Use cash only for this
Workaround
Makes the spending visible, against everything that is more convenient.
Stop entirely for a while
Behaviour
The largest saving, traded against the thing itself.

A small expense at the scale of one purchase is not worth weighing, and at the scale of a year it is significant, but it is only ever encountered at the scale of one.
Why existing solutions fail: Every finance tool aggregates by category and by month, so a small habit shows up as a faint line among many, never as the year's figure, which is the only one large enough to mean anything.
Potential opportunity: Presenting this one habit at annual scale at the moment of purchase, rather than in a monthly report read later.
Loyalty schemes are designed to pull buying above its natural rhythm, and are presented to the buyer as a reward.
Why existing solutions fail: Reward thresholds always sit just above the average rate, because setting them at the rate would change no behaviour and not be worth running, so the mechanism works only when it pushes the buyer past their intention.
Potential opportunity: A reward computed on the customer's existing rhythm rather than on a threshold to reach for.