Referring to “Trump stiffed me on $100G deal on pianos” [Opinion, Oct. 1], piano salesman J. Michael Diehl’s problem was not with Donald Trump, it was with his own substandard lawyer, accountant and training in business management.

When a business extends credit to a company, it is effectively taking the same risk as an equity investor. Diehl’s attorney said the Trump name was sufficient grounds to extend credit in lieu of credit risk analysis.

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Further, basic accounting dictates that when a debtor makes a partial payment, the unpaid balance remains on the books as a receivable. Monthly billings should be generated and collection practices applied until the balance is paid down to zero.

This is a case of someone making a bad business decision and looking for someone else to blame — especially now that, 27 years later, it’s accepted as part of a fashionable witchhunt against Trump.

For Newsday to cherry-pick this shallow opinion and dedicate a quarter of a page to it is disappointing.

Vincent Cristiano, Ronkonkoma

Editor’s note: The writer is a former bank financial officer. He has taught business management courses.