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Related Concept Videos

Equity Theory01:26

Equity Theory

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Equity theory explains how our sense of fairness influences the dynamics of close relationships. Rooted in social psychology, the theory posits that individuals evaluate fairness by comparing the ratio of their contributions to the rewards they receive. Relationship satisfaction is highest when these ratios are perceived as balanced between partners, promoting mutual reciprocity and a sense of justice.Equity vs. Equality in RelationshipsEquity is distinct from equality. Fairness does not...
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According to some social psychologists, people tend to overemphasize internal factors as explanations—or attributions—for the behavior of other people. They tend to assume that the behavior of another person is a trait of that person, and to underestimate the power of the situation on the behavior of others. They tend to fail to recognize when the behavior of another is due to situational variables, and thus to the person’s state. This erroneous assumption is...
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Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned...
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Social Exchange Theory01:26

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As formulated by John Thibaut and Harold Kelley, Social Exchange Theory explains human relationships as economic-like exchanges that maximize rewards and minimize costs. This theory suggests that individuals engage in relationships to gain benefits and reduce burdens, similar to economic transactions. It has been widely applied to various types of relationships, including romantic, professional, and social interactions.Rewards and Costs in RelationshipsRelationship rewards include emotional...
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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Cause and Effect01:53

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While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
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Updated: Mar 13, 2026

The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies
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Toward refining and contextualizing the root economics space.

Liang Kou1, Wanyu Zuo1, Grégoire T Freschet2

  • 1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.

Trends in Ecology & Evolution
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

The root economics space (RES) framework needs refinement. Incorporating symbiotic strategies and nutrient limitation enhances its applicability across diverse plant types and ecosystems.

Keywords:
absorptive rootsbelowground strategyecosystem nutrient limitationmycorrhizal typeroot economics spaceroot functional traits

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Area of Science:

  • Plant Ecology
  • Root Biology
  • Ecosystem Science

Background:

  • The root economics space (RES) framework models plant belowground strategies using 'fast-slow' and 'collaboration' gradients.
  • Evidence suggests RES axes vary across plant types and environments, questioning its universal applicability.

Purpose of the Study:

  • To refine the RES framework by incorporating functionally relevant root traits.
  • To contextualize RES axes by accounting for symbiotic strategies (arbuscular, ectomycorrhizal, ericoid, dual-mycorrhizal, nonmycorrhizal) and nutrient limitation.
  • To define the appropriate spatial scales and organizational levels for RES application.

Main Methods:

  • Integrating diverse root traits into the RES framework.
  • Analyzing symbiotic associations and nutrient limitation patterns.
  • Defining the scope and scale of RES applicability.

Main Results:

  • Proposed a refined RES framework incorporating symbiotic strategies and nutrient limitation.
  • Highlighted the need to contextualize RES axes for different plant types and ecosystems.
  • Identified key spatial and organizational levels for effective RES application.

Conclusions:

  • The refined RES framework offers a more generalized and context-specific approach to understanding plant belowground strategies.
  • Accounting for mycorrhizal associations and nutrient availability is crucial for RES applicability.
  • Future research should focus on applying the refined RES framework across various ecological scales and contexts.