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Application

Environmental subsidies

How subsidy programmes for eco-friendly products can better reach households that would not buy without support.

Less windfall

funds go less often to households that would have bought anyway

Waiting as a filter

without verifying income or intentions

More impact

per euro spent, with the same budget

Approach Materials Publications

Starting point

The problem

Governments subsidise cargo bikes, e-bikes, electric cars and energy-efficient retrofits. Part of the money goes to households that would have bought anyway, crowding out those who buy only when subsidised.

Approach

The solution

Households that would buy anyway tend to be more impatient and reluctant to wait for approval. A longer time between application and payment therefore shifts funds towards households whose purchase actually depends on the subsidy.

The approach

  1. Apply. Households apply for the subsidy as before.
  2. Set the waiting time. A waiting time separates application and payment; a uniform wait-time auction sets it so that as many households as possible are reached who buy only with support.
  3. Self-selection. Those who would buy anyway often buy right away without the subsidy. The funds remain for the households for whom they make the difference.

Project

2023–2024

Tapping into people’s impatience for better environmental subsidies

Research on mechanisms that use households’ impatience to make subsidy programmes better targeted.

Funded by the ZEW Sponsors’ Association

Materials

Policy brief

Tapping into People’s Impatience for Better Environmental Subsidies

How waiting times raise the efficiency of subsidy programmes.

ZEW, 2023

Practitioner article

Mit Ungeduld zu besseren Subventionen für umweltfreundliche Produkte

The approach applied to German subsidy practice.

Wirtschaftsdienst, 2025, German

Publications

Show list
  1. 2
    Mit Ungeduld zu besseren Subventionen für umweltfreundliche Produkte
    Wirtschaftsdienst 06/2025 (2025) · A. Atayev, G. Caspari, A. Hillenbrand, T. Klein
  2. 1
    Tapping into People’s Impatience for Better Environmental Subsidies
    ZEW Policy Brief 4/2023 (2023) · A. Atayev, G. Caspari, A. Hillenbrand, T. Klein

Planning a subsidy programme?

I am happy to discuss how waiting times and selection rules could work for your programme.

Send an email
Kontakt [email protected]
Prof. Dr. Thilo Klein
Hochschule Pforzheim
Fakultät für Wirtschaft und Recht
Tiefenbronner Straße 65
75175 Pforzheim
© 2026 Thilo Klein · Impressum und Datenschutz Nach oben ↑
Contact [email protected]
Prof. Dr. Thilo Klein
Pforzheim University
Faculty of Business and Law
Tiefenbronner Straße 65
75175 Pforzheim, Germany
© 2026 Thilo Klein · Legal notice and privacy Back to top ↑