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We study the effect of financial resources on decision-making. Low-income US households are randomly assigned to receive an online survey before or after payday. The survey collects measures of cognitive function and administers risk and intertemporal choice tasks. The study design generates variation in cash, checking and savings balances, and expenditures. Before-payday participants behave as if they are more present-biased when making intertemporal choices about monetary rewards but not when making intertemporal choices about nonmonetary real-effort tasks. Nor do we find before-after differences in risk-taking, the quality of decision-making, the performance in cognitive function tasks, or in heuristic judgments. (JEL C83, D14, D81, D91, I32)

In this text a leading economist discusses the potential of happiness research (the qualification of well-being) to answer important questions that standard economics methods are unable to analyze. Emphasizing empirical evidence rather than theoretical conjectures, Frey substantiates the need for happiness research.

The stalling of COVID-19 vaccination rates threatens public health. To increase vaccination rates, governments across the world are considering the use of monetary incentives. Here we present evidence about the effect of guaranteed payments on COVID-19 vaccination uptake. We ran a large preregistered randomized controlled trial (with 8286 participants) in Sweden and linked the data to population-wide administrative vaccination records. We found that modest monetary payments of 24 US dollars (200 Swedish kronor) increased vaccination rates by 4.2 percentage points (P = 0.005), from a baseline rate of 71.6%. By contrast, behavioral nudges increased stated intentions to become vaccinated but had only small and not statistically significant impacts on vaccination rates. The results highlight the potential of modest monetary incentives to raise vaccination rates.

This chapter provides a framework for how incentives affect behavior change. Economic theory is built on the premise that incentives matter, but empirical evidence shows the effect of incentives on behavior is more complicated than predicted by the basic law of demand. Our framework highlights four potential "channels" through which incentives can affect behavior change: First, incentives can help create "desirable" or "adaptive" habits by building up the stock of behavior. Increasing recent experience makes current behavior less costly and more enjoyable. Second, incentives can help "kill" undesirable or maladaptive habits by reducing the stock of behavior. Decreasing recent experience makes current behavior costlier and less enjoyable. Third, incentives can help counter present bias. Using frequent and regular incentives helps change behavior. Fourth, incentives can help remove barriers to change. Using incentives to reduce switching costs makes uptake of the desired behavior or activity cheaper or even free. These four channels and the supporting empirical evidence for them have implications for how incentive-based interventions work and provide guidance on how best to design them for optimal efficacy.