Quickly register to comment, Ask questions, and/or keep up to date on new fallacies.
Register!

one moment please...




  • False Conversion
  • False Dilemma
  • False Effect
  • Far-Fetched Hypothesis
  • Faulty Comparison
  • Gambler’s Fallacy
  • Genetic Fallacy
  • Hasty Generalization
  • Having Your Cake
  • Hedging
  • Historian’s Fallacy
  • Homunculus Fallacy
  • Hypnotic Bait and Switch
  • Hypothesis Contrary to Fact
  • The Fallacies: If–Mu
  • If-By-Whiskey
  • Illicit Contraposition
  • Illicit Major
  • Illicit Minor
  • Illicit Substitution of Identicals
  • Inconsistency
  • Inflation of Conflict
  • Jumping to Conclusions
  • Just Because Fallacy*
  • Just In Case Fallacy
  • Least Plausible Hypothesis
  • Limited Depth
  • Limited Scope
  • Logic Chopping
  • Ludic Fallacy
  • Lying with Statistics
  • Magical Thinking
  • Meaningless Question
  • Misleading Vividness
  • Missing Data Fallacy*
  • Modal (Scope) Fallacy
  • Moralistic Fallacy
  • Moving the Goalposts
  • Multiple Comparisons Fallacy
  • The Fallacies: Na–Ri
  • Naturalistic Fallacy
  • Negating Antecedent and Consequent
  • Negative Conclusion from Affirmative Premises
  • Nirvana Fallacy
  • No True Scotsman
  • Non Sequitur
  • Notable Effort
  • Overwhelming Exception
  • Package-Deal Fallacy
  • Poisoning the Well
  • Political Correctness Fallacy
  • Post-Designation
  • Prejudicial Language
  • Proof by Intimidation
  • Proving Non-Existence
  • Quantifier-Shift Fallacy
  • Quantum Physics Fallacy*
  • Questionable Cause
  • Rationalization
  • Red Herring
  • Reductio ad Absurdum
  • Reductio ad Hitlerum
  • Regression Fallacy
  • Reification
  • Relative Privation
  • Retrogressive Causation
  • Rights To Ought Fallacy*
  • The Fallacies: Sc–Wi
  • Scapegoating
  • Selective Attention
  • Self-Sealing Argument
  • Shoehorning
  • Slippery Slope
  • Special Pleading
  • Spiritual Fallacy*
  • Spotlight Fallacy
  • Statement of Conversion
  • Stereotyping
  • Stolen Concept Fallacy
  • Strawman Fallacy
  • Style Over Substance
  • Subjectivist Fallacy
  • Subverted Support
  • Sunk-Cost Fallacy
  • Suppressed Correlative
  • Texas Sharpshooter Fallacy
  • Tokenism
  • Two Wrongs Make a Right
  • Unfalsifiability
  • Unwarranted Contrast
  • Use-Mention Error
  • Weak Analogy
  • Willed Ignorance
  • Wishful Thinking
  • Sunk-Cost Fallacy

      Get the Book!


    Get the book, Logically Fallacious by Bo Bennett, PhD by selecting one of the following options:


    Get It!

    (also known as: concorde fallacy)

    Description: Reasoning that further investment is warranted on the fact that the resources already invested will be lost otherwise, not taking into consideration the overall losses involved in the further investment.

    Logical Form:

    X has already been invested in project Y.

    Z more investment would be needed to complete project Y otherwise X will be lost.

    Therefore, Z is justified.

    Example #1:

    I have already paid a consultant $1000 to look into the pros and cons of starting that new business division.  He advised that I shouldn’t move forward with it because it is a declining market.  However, if I don’t move forward, that $1000 would have been wasted, so I better move forward anyway.

    Explanation: What this person does not realize is that moving forward will most likely result in the loss of much more time and money.  This person is thinking short-term, not long-term, and is simply trying to avoid the loss of the $1000, which is fallacious thinking.

    Example #2: There are ministers, priests, pastors, and other clergy all around the world who have invested a significant portion of their lives in theology, who can no longer manage to hold supernatural beliefs -- who have moved beyond faith.  Hundreds of them recognize those sunk-costs and are searching for the best way to move on (see http://www.clergyproject.org) whereas many others cannot accept the loss of their religious investment, and continue to practice a profession inconsistent with their beliefs.

    Explanation: Of course, the clergy who have not moved beyond faith and are living consistent with their beliefs have not committed this fallacy.

    Exception: If careful evaluation of the hypothetical outcomes of continued investment versus accepting current losses and ceasing all further investment have been made, then choosing the former would not be fallacious.

    Tip: Is there any part of your life where you continue to make bad investments because you fear losing what was already invested?





    Registered User Comments



     Copyright 2016, Archieboy Holdings, LLC.