Managerial Economics & Pricing Lab

Two-Part Tariff & Access Pricing Calculator

Model two-part tariff pricing, fixed platform access fees, variable usage rates, consumer surplus extraction, and multi-segment profit optimization.

Tariff Engine Segment Participation Economic Theory FAQ

Pricing Archetypes

Load calibrated access & usage models.

Step 1: Set Two-Part Tariff Structure & Segment Demand

Pricing & Cost Parameters

Lump-sum subscription or gate entry.
Per-call, per-seat, or per-ride fee.
Direct variable delivery cost per unit.
Monthly infrastructure & platform cost.

Customer Demand Segments

Segment 1: Light Users

Segment 2: Medium Users

Segment 3: Heavy Users

Monthly Net Profit
$224,960 / mo
+$48,200 vs. flat-fee model
Total Monthly Revenue
$286,210
$133,650 fixed + $152,560 usage
Active Subscribers
1,350 / 1,350
100.0% market participation
Gross Profit Margin
83.8%
Gross Profit: $239,960

Segment Consumption, Consumer Surplus & Profit Contribution

Analysis of customer willingness-to-pay, surplus extraction, and churn risk when fixed fee T exceeds segment surplus.

Segment Active Accounts Units / Account Gross Surplus (CS) Net Buyer Value (CS - T) Fixed Rev Usage Rev Segment Profit

Microeconomic Pricing Strategy

Principles of Two-Part Tariff Pricing

Key economic insights pioneered by Walter Oi (1971):

  • Surplus Extraction: Unlike single linear pricing where high prices cause deadweight loss, two-part tariffs set $p approx MC$ to maximize consumption and use $T$ to extract buyer surplus.
  • The Participation Constraint: If the fixed fee $T$ is set too high ($T > CS_{ ext{light}}$), lower-volume buyers churn, causing lost fixed revenue.
  • Heterogeneous Buyer Balancing: In multi-segment markets, firms set $p > MC$ to capture additional surplus from heavy buyers while keeping $T$ low enough to retain light buyers.
  • Superior Profitability: Two-part tariffs strictly dominate pure flat subscriptions and pure usage billing across multi-segment customer bases.

Compare tiered volumes in the Volume Discount Lab.

Mathematical Formulation

Two-part tariff equations

Usage_Quantity: q(p) = q_0 × [ 1 - ( p ÷ P_max ) ]

Consumer_Surplus: CS = 0.5 × ( P_max - p ) × q(p)

Participation: Active = ( CS ≥ T )

Total_Revenue = ∑ N_active × [ T + ( p × q ) ]

Net_Operating_Profit = Total_Revenue - ∑ ( N_active × MC × q ) - FC

Explore lifecycle pricing in the Price Skimming vs Penetration Lab.

FAQ

Two-part tariff questions

What is a two-part tariff pricing model?

A two-part tariff is a pricing structure where consumers pay two distinct charges: a fixed lump-sum access or entry fee (T) for the right to buy, plus a per-unit variable usage charge (p) for each unit consumed.

How does a two-part tariff extract consumer surplus?

By pricing the variable rate close to marginal cost (p ≈ MC) to maximize total consumer consumption, and setting the fixed access fee (T) equal to the consumer surplus generated, the seller converts customer surplus into producer profit.

What is a participation constraint in two-part tariffs?

A participation constraint requires that a buyer's net consumer surplus from using the service is greater than or equal to the fixed access fee (CS >= T). If T exceeds CS, the buyer drops out and does not purchase.

How do businesses optimize two-part tariffs for different customer segments?

When serving light, medium, and heavy users, sellers raise the per-unit usage fee above marginal cost to extract extra surplus from heavy users while lowering the fixed fee so lighter users remain profitable active subscribers.

Can I export the two-part tariff model to CSV?

Yes. You can export complete fixed fees, usage rates, segment consumption, revenue breakdowns, and net operating profit as a UTF-8 CSV spreadsheet with formula defense.

Continue Exploring Pricing & Economics Tools

Explore our Pricing & Profit Hub, evaluate price skimming in the Price Skimming vs Penetration Lab, test dynamic load factors in the Dynamic Peak Pricing Lab, simulate product bundles in the Bundle Pricing Lab, or calculate wholesale discounts in the Volume Discount Tier Lab.