Operating leverage gave you DOL = Contribution/EBIT at company level. Unit economics tells you where the fixed costs are, and they come at two altitudes, each with its own breakeven:
- Above the units (corporate fixed). Break-even units
N* = corporate fixed costs ÷ contribution per unit. A SaaS company with ₹120 cr of fixed R&D + G&A and ₹24,000 of annual contribution per customer needs 50,000 customers to breakeven. Its unit economics can be perfect while the company bleeds, simply because N < N*. "Great unit economics, sub-scale company" is a legitimate thesis only if the path from N to N* is fundable and the cohorts hold while you travel it. - Inside the unit (capacity fixed). Most units are little fixed-cost machines themselves. Think of a store's staff and rent, a dark store's riders, a hotel's property, an engineer's salary. None of them care whether the unit is busy. Here the breakeven is a utilisation threshold, and it's the master KPI of every capacity business:
Break-even utilization = fixed cost per available capacity-unit ÷ contribution per occupied capacity-unit
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Break-even point examples: a hotel and IT services
Hotel. Take 120 rooms with a fixed cost of ₹3.6 lakh/day. ADR is ₹5,000 and variable cost per occupied room is ₹1,000, so contribution is ₹4,000 per occupied night. Breakeven = 360,000/4,000 = 90 rooms = 75% occupancy. At 65%, the property loses money every day. At 85%, twelve extra rooms × ₹4,000 = ₹48,000/day, and nearly all of it is profit. Occupancy that high also lets ADR itself rise, so contribution compounds on contribution. That convexity around the threshold makes hotel and airline earnings violent in both directions. Low-cost carriers' load-factor breakevens of ~80–85% are this same formula with fuller planes.
IT-services billed hour. This one matters a lot in India. An engineer costs ₹12 lakh/yr fully loaded, with ~2,000 available hours at a realised rate of ₹2,100/hr. Other direct costs are ₹10 lakh/yr. At 85% utilisation, revenue = 1,700 × 2,100 = ₹35.7 lakh, leaving a margin of ₹13.7 lakh (38%). At 75%, revenue is ₹31.5 lakh and margin ₹9.5 lakh (30%). Each utilisation point = 20 hours × ₹2,100 = ₹42,000 straight to margin. No wonder the IT services playbook watches utilisation (healthy band 82–87%) like a hawk. It's also why "we're hiring ahead of demand", which pushes utilisation down, is a margin warning wearing a growth costume.
Break-even utilisation here = 22,00,000 ÷ (2,000 × 2,100) = 52%, comfortably low. That's the structural reason IT services is a good business and airlines, with breakeven at ~80%+, are a hard one. The gap between normal utilisation and break-even utilisation is the business's margin of safety, in operating terms.
When are fixed costs not really fixed?
One last nuance. Fixed costs are fixed only in steps. Warehouses fill, servers saturate, a second shift needs a supervisor, and so "fixed" costs step up with scale. True scale economies, which you'll study with the moats, exist only where a cost really is amortising over more units: brand, R&D, a national distribution grid. Where the steps just haven't been hit yet, there's no scale economy. Cohort-and-unit data tells you which case you're in. The deck always claims the first.