Is Cheap Talk Effective at Eliminating Hypothetical Bias in a Provision Point Mechanism?

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Testing the Effectiveness of Certainty Scales, Cheap Talk, and Dissonance-Minimization in Reducing Hypothetical Bias in Contingent Valuation Studies (2009, methodology): “When Murphy et al. (2005a) excluded from the sample the ratios resulting from bias-reducing methods, the mean ratio rose to 5.42, with a median of 2.66.”
A Comparison of Approaches to Mitigate Hypothetical Bias (2009, background): “Murphy, Stevens, and Weatherhead (2005) also used the long cheap talk script in a laboratory setting with a public good.”
Hypothetical bias in stated choice experiments: Part II. Macro-scale analysis of literature and effectiveness of bias mitigation methods (2021, background): “As Murphy et al. (2005) have pertinently pointed out, ‘no single technique will be the “magic bullet” that eliminates this bias.”
Environmental Cost-Benefit Analysis (2008, background): “(36), Cummings & Taylor (40), List (41), Poe et al.”
Eliciting Willingness to Pay Without Bias: Evidence from a Field Experiment (2008, unknown): “In a study by Murphy et al. (2005) on a voluntary contribution mechanism, the cheap talk approach did not fully remove the hypothetical bias.”