The CGD Podcast – “Scarcity: Why Having So Little Means So Much”

Guest: Sendhil Mullainathan (Harvard Professor, co-author of “Scarcity”)
Host: Lawrence MacDonald (Center for Global Development)
Date: April 7, 2014

Overview

In this episode, Lawrence MacDonald interviews Sendhil Mullainathan about his influential book Scarcity: Why Having Too Little Means So Much (co-authored with Eldar Shafir) and a related working paper with Sugato Datta. Mullainathan delves into the psychological and cognitive effects of scarcity—whether of time, money, or resources—and explores how these dynamics impact everyone, from busy professionals to the world’s poorest individuals. The discussion moves from personal anecdotes to evidence from field experiments, with a particular focus on how scarcity shapes the psychology and behavior of the poor, and how development policy can be re-designed in light of these insights.

Key Discussion Points & Insights

1. What Is Scarcity and Why It Matters

• Scarcity Is Universal: All people experience scarcity (of time, money, etc.), and the psychology of scarcity is consistent, whether among affluent or poor individuals.

  • “When we say ‘I have too little time’ and the poor say ‘I have too little money,’... there’s actually a psychology of scarcity, something that kicks in when we have too little. And that same force kicks in whether you’re a busy CEO or whether you’re a poor person living on a dollar a day.” — Mullainathan (01:44)

• Focus and Tunneling: Scarcity causes the mind to focus intensely on the missing resource, often at the expense of addressing other important needs.

  • “When you have too little, your mind automatically focuses.” — Mullainathan (02:23)
  • Example: Starvation experiment after WWII; starved men could only think about food (02:36)

• Positive and Negative Sides: Focus caused by scarcity can be productive (helps meet urgent needs, makes the poor stretch resources efficiently) but also causes neglect of the important-but-not-urgent.

  • “We tunnel on the urgent and then we neglect the important, which is not urgent.” — Mullainathan (04:12)

2. Bandwidth & Cognitive Consequences of Scarcity

• Mental Bandwidth: Scarcity consumes significant "bandwidth," leaving less cognitive capacity for other tasks or long-term planning. This is as true for time-stressed professionals as for the financially poor.

  • “You just have less bandwidth for the rest of life.” — Mullainathan (07:40)

• Neglecting the ‘Important’: Because urgent matters dominate one’s attention, critical long-term actions (e.g., preventive health, investing in better tools) get postponed.

  • Example: A rag picker keeps postponing buying her own cart, even though it would pay off, because making rent is always more urgent. (05:20)

• Bandwidth Depletion Is Real and Measurable: Experiments show that poverty has cognitive effects akin to losing several hours of sleep (pulling an “all-nighter” every day).

  • “It’s as if when the poor are poor, they’re pulling an all-nighter every day.” — Mullainathan (18:26)

3. Policy Implications: Designing Programs for the Poor

• Scarcity of Self-Control: Scarcity itself reduces self-control and executive function, making it difficult to comply with well-intended policies that demand complex behavioral hoops.

  • “If we tax it [bandwidth or self-control] in one place, there is less of it elsewhere.” — Mullainathan (14:04)

• Cognitive Costs in Policy: Many anti-poverty programs inadvertently impose cognitive ‘taxes’ on the poor (e.g., onerous conditionalities for cash transfers), without accounting for the cognitive burden.

  • “At some level, it’s as if we’re doing the worst thing you could do in economics, which is not measuring a resource and treating it like free. That is like the biggest No-No in economics.” — Mullainathan (14:40)

• Smarter Program Design: Policy design must recognize and minimize cognitive and self-control costs:

  • “At least being cognizant…imposes a discipline on the system that every new thing we add is coming at some cost. Even as a team just deciding, could this even possibly be worth the cost?” — Mullainathan (15:00)

4. Timing and Bandwidth in Practice: The Fertilizer Example

• Timing Matters: After harvest, farmers have more money and more cognitive bandwidth—optimal for planning and purchasing inputs like fertilizer.

  • “Why not get people to make their fertilizer decision post-harvest when they're both cash rich but also bandwidth rich?” — Mullainathan (19:02)

• Experiments & Evidence: Simple executive-control tests (like “Heart and Flower”) show measurable differences in cognitive function across times of financial stress and abundance. (16:37–17:38)

• Implications Beyond Poverty: Scarcity insights are broader—affecting anyone under stress—so timing large decisions to moments of high bandwidth can benefit all.

5. Broader Impact and Reception

• Policy and Popular Culture: The recognition of attention as a scarce commodity is gaining traction in policy circles and the general public. Innovations are already underway (e.g., Dutch government insurance reforms).

  • “I've been very heartened to see that a lot of people in policy circles are now starting to take it seriously.” — Mullainathan (21:20)

• A Universal Perspective: Mullainathan stresses the goal is not to offer a single magic-bullet policy, but a mindset shift that unlocks creative, more humane solutions.

• Accessible Scholarship: The book was intentionally written to be readable by non-economists, making the science of scarcity accessible to all.

  • “My mom, who does not read books, listened to the audiobook and said she understood all of it…” — Mullainathan (22:27)

Notable Quotes and Highlights with Timestamps

• On the universal nature of scarcity:

  • “That same force kicks in whether you're a busy CEO or whether you're a poor person living on a dollar a day.” — Mullainathan (01:44)

• On tunneling and neglect:

  • “We tunnel on the urgent and then we neglect the important, which is not urgent.” — Mullainathan (04:12)

• On bandwidth and parenting:

  • “You go home to spend time with your kids. Unfortunately, you're not all present there... your mind is like, what about that project? What about that project? And that means you just have less bandwidth for the rest of life.” — Mullainathan (07:40)

• On cognitive costs in policy:

  • “At some level, it's as if we're doing the worst thing you could do in economics, which is not measuring a resource and treating it like free.” — Mullainathan (14:40)

• Measuring the effect of scarcity:

  • “It's as if when the poor are poor, they're pulling an all-nighter every day.” — Mullainathan (18:26)

• On taking bandwidth into policy design:

  • “If all of us start thinking in these terms, the natural creativity of people will open up many other policy solutions.” — Mullainathan (21:20)

Important Segments & Timestamps

• 00:16–01:44 — Introduction, personal anecdotes, and the suitcase metaphor for scarcity.
• 01:44–04:12 — Defining scarcity, universality, and tunneling (focus on the urgent vs. the important).
• 05:04–07:40 — Real-life examples: The rag-picker, juggling urgent vs. important tasks, bandwidth depletion in poor vs. affluent.
• 08:19–10:05 — Mars orbiter & healthcare.gov: Organizational failure due to tunneling from deadline stress.
• 12:02–15:00 — Application to development policy: Scarcity of self-control, cognitive costs, design flaws in current anti-poverty programs.
• 16:01–19:47 — Field experiment: Bandwidth testing with farmers, timing interventions for impact (fertilizer decision).
• 20:34–22:08 — Broader implications: Scarcity mindset as a framework for policy and everyday life.
• 22:27–22:35 — Accessibility, outreach, and closing comments.

Takeaways for Listeners

• Scarcity creates a “tunnel vision” that impairs overall cognitive function and causes neglect of important long-term needs.
• These effects are powerful, measurable, and occur regardless of the specific resource that’s scarce.
• Development programs must be designed with an awareness of the cognitive costs imposed on recipients, not just monetary or logistical constraints.
• Interventions (from fertilizer subsidies to health education) are more effective when timed to periods of recipient “bandwidth.”
• This insight into the psychology of scarcity is transforming both policy thinking and everyday approaches to decision-making.