Tangible Goods Simulation for Field BDM Auctions

In Simple Words

Before asking someone to place real cash bids on a complex multi-page financial contract, you let them play a practice round bidding 5 cents on a candy bar so they visually see how higher and lower bids win or lose the prize.

Research question

Eliciting true willingness to pay for complex financial contracts in low-literacy field settings using Becker-DeGroot-Marschak (BDM) mechanisms frequently fails due to subject confusion regarding pricing rules.

Participants

N = 1,978 smallholder farmers in rural Andhra Pradesh, India.

Study Design

Incentive-compatible BDM field game protocol incorporating mandatory preliminary practice rounds bidding on a chocolate bar prior to financial policy elicitations.

Results

Practice rounds enabled successful implementation of 4-contract BDM elicitations across 1,978 rural subjects, resulting in zero instances of participants refusing to complete winning transactions.

Takeaway

Conduct practice bidding rounds using simple tangible items like chocolate bars before administering BDM willingness-to-pay mechanisms for complex financial products.

Related findings

• Order Independence in Field BDM Valuation →Methods & evidence

  Imagine evaluating four houses in a row; if viewing an expensive mansion first causes someone to bid higher on a small cottage afterwards, the valuation tool is broken, but if the bidding price for the cottage remains identical regardless of house order, the measurement tool is robust.

• Birthdate-Based Randomization Design →Methods & evidence

  Assigning people based on their birthdate works like splitting a crowd into two equal groups based on whether their ticket number is odd or even. Because birthdays are evenly distributed across the population, everyone born in the first half of the month gets one treatment and those born in the second half get another, creating two balanced groups without bias.

• Caste-Stratified Market Penetration Randomization →Methods & evidence

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• Evaluation Time Horizon Bias →Methods & evidence

  Evaluating a policy right after it starts is like testing a person's diet on day one when they have not had time to buy snacks or change their routine. True long-term policy impacts can only be measured after people have had enough time to notice the change, adjust their habits, and settle into a new equilibrium.