
Cold Call Why the Commonwealth Bank of Australia Opened Up to Customers about Credit Card Risks
Mar 3, 2026
Leslie John, Harvard Business School behavioral scientist and author known for research on decision-making and disclosure. She explores the Commonwealth Bank’s choice to reveal credit-card downsides to customers. Short takes cover why revealing feels risky, how to design honest disclosures without sounding manipulative, and when openness helps or harms organizations.
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Honesty About Downsides Can Build Trust
- Radical honesty can deepen trust even when it highlights product downsides.
- Commonwealth Bank considered listing credit card tradeoffs (fees, high interest) to help customers find better fits despite marketing risks.
Credit Card Profits Depend On Customer Mistakes
- Banks profit from customers' mistakes, so revealing downsides tests a firm's values.
- Commonwealth Bank knew its most profitable card customers were revolvers who carry balances, making the experiment high-stakes.
Use Measured Vulnerability To Build Credibility
- Leaders should reveal calibrated vulnerabilities to increase employee trust and useful feedback.
- Amy Cunningham acknowledging uncertainty about the experiment would boost credibility and motivate employees despite P&L risk.



