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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Intergenerational resource transfers with random offspring numbers.

Kenneth J Arrow1, Simon A Levin

  • 1Department of Economics, Stanford University, Stanford, CA 94305-6072, USA.

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Area of Science:

  • Interdisciplinary research bridging biology and economics.
  • Focus on resource allocation and intergenerational transfers.

Background:

  • Parental resource allocation to offspring is a fundamental biological and economic process.
  • Previous models often assumed a known number of offspring.

Purpose of the Study:

  • To model parental resource allocation when the number of offspring is uncertain.
  • To analyze the impact of uncertainty on consumption and investment decisions.

Main Methods:

  • Developed a theoretical framework based on three core assumptions:
  • 1. Resources are allocated between parental consumption and child transfers.
  • 2. Parental welfare incorporates a recursively discounted concern for offspring welfare.
  • 3. Transferred resources are subject to productive investment (growth or decline).

Main Results:

  • Derived precise formulas for resource allocation under uncertainty.
  • Demonstrated that uncertainty about offspring number can influence the balance between parental consumption and investment.
  • Wealth distribution is predicted to follow a log-normal pattern.

Conclusions:

  • Parental resource allocation decisions are sensitive to the uncertainty of offspring numbers.
  • The study provides a framework for understanding intergenerational resource transfers in dynamic environments.
  • Economic implications include potential shifts in consumption patterns and wealth distribution.