Does the Lambert Function Apply to Solving This Economic Model?

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Discussion Overview

The discussion revolves around the application of the Lambert function to solve an equation from microeconomics, specifically related to consumer demand and pricing strategies. Participants explore the mathematical formulation and its implications within an economic model.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Samuel presents an equation, \(\Omega = \rho^k (1-k\cdot \ln \rho)\), and expresses uncertainty about solving for \(k\), suggesting a potential connection to the Lambert function.
  • One participant asserts that the Lambert function does apply to the problem, but no further elaboration is provided.
  • Samuel reiterates his interest in understanding how the Lambert function relates to the equation and the context of the model, which involves consumer demand accumulation over time.
  • Samuel explains that the equation arises from a firm's first-order condition (FOC) in a model where demand accumulates for consumers who delay purchases, detailing the mathematical representation of accumulated demand.

Areas of Agreement / Disagreement

There is no clear consensus on the applicability of the Lambert function to the equation presented, as participants have differing levels of engagement and understanding regarding the connection.

Contextual Notes

The discussion does not resolve the mathematical steps necessary to apply the Lambert function to the equation, and assumptions about the parameters involved remain unexamined.

Sammuueel
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Dear Forum,

I am a researcher in the field of microeconomics and I came across this equation which I would like to solve for [itex]k[/itex]. It looks a little bit like the Lambert function. But I am stuck here.
[itex]\Omega = \rho^k (1-k\cdot \ln \rho)[/itex]

Do you have an idea how I could proceed?

Kind regards,
Samuel
 
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Sammuueel said:
Dear Forum,

I am a researcher in the field of microeconomics and I came across this equation which I would like to solve for [itex]k[/itex]. It looks a little bit like the Lambert function. But I am stuck here.
[itex]\Omega = \rho^k (1-k\cdot \ln \rho)[/itex]

Do you have an idea how I could proceed?

Kind regards,
Samuel

Jacquelin gave the answer... but I'm interested, how did this come up?
 
Thank you Jacqueline!

This is from a model where the demand of a consumer accumulates if he does not make a purchase in one period. This accumulated deteriorates with a factor ρ (e.g.0.9). After k periods without purchase, the demand is [itex]\rho + \rho^2 + ... + \rho^k = \frac{1-\rho^k}{1-\rho}[/itex].

The term shown in my problem is from a firm's FOC who chooses a set of prices for high-valuation consumers (who purchase in each period) and low-valuation purchases (whose demand accumulates).


Samuel
 

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