The 2 Inventions That Built the Modern Credit Card

A revolution nobody requested

The plastic card in most American wallets didn't arrive because customers asked for it. In its most consequential early form, it arrived because a bank mailed it to people who hadn't.

This chapter is about the two inventions that built the modern credit card — and the moment one of them tried to force adoption at a scale the industry wasn't ready to handle responsibly.

Diners Club: the first card that worked everywhere

Frank McNamara and his attorney Ralph Schneider founded Diners Club in New York in 1950. The company's own origin story — McNamara forgetting his wallet at a business dinner and resolving never to be caught short again — is charming enough to repeat, whether or not it's the full truth.

What matters more is what Diners Club actually was. Not the first charge card of any kind, as it's sometimes credited: Western Union had issued metal charge plates to favored customers since 1914, oil companies ran courtesy cards in the 1920s, and department stores issued embossed "Charga-Plates" from 1928.¹

It was the first third-party, multi-merchant card — usable across many unrelated businesses rather than tied to one store or gas company. That's the distinction worth keeping. Diners Club didn't invent buying on someone else's credit. It invented buying on someone else's credit anywhere.

BankAmericard and the test that got out of hand

Bank of America launched BankAmericard on 18 September 1958, choosing Fresno, California as the test market.²

What happened there deserves more detail than the popular version offers. Bank of America mailed live, already-activated credit cards, unsolicited, to a large share of the city's adult population. The figure commonly cited is roughly 60,000 people — but that number traces to a 1994 book rather than to any contemporaneous 1958 record or surviving bank document, and should be treated as a widely repeated estimate rather than a confirmed count.³

The bank's product architect, Joseph P. Williams, reportedly expected delinquency under 4 percent. Actual delinquency ran closer to 20 to 22 percent, with losses approaching $9 million within about a year. Real, serious numbers — though like the card count, they rest mainly on secondary retellings rather than an audited contemporaneous source.³

What Fresno gets blamed for

Popular retellings treat the "Fresno Drop" as the origin of the whole mass-mailed-card problem, and as the direct cause of the law that eventually banned the practice. Both claims oversimplify.

Fresno was a test market that ran into real trouble. But mailing live, unsolicited cards became an industry-wide phenomenon in the years that followed, at a scale Fresno never approached.

Across 1966 and 1967, roughly 129 new bank card programs launched in eighteen months, and something like 10 million unsolicited live cards were circulating nationally — nearly half issued with no credit check at all.

The most notorious episode wasn't Fresno. It was Chicago, in the winter of 1966 into early 1967. One bank, Pullman Bank & Trust, broke ranks with its banking-association partners and mailed cards first. Competitors followed rather than be left behind, flooding the city's holiday mail with live cards — including, by some accounts, one addressed to a woman who had been dead for five months, and others addressed to infants.

Estimated fraud losses from Chicago alone ran $6 to 12 million. Industry-wide 1966 losses have been estimated as high as $100 million, though the figures vary by source and aren't fully reconcilable.⁴

The law that ended it

Congress responded with Public Law 91-508, signed 26 October 1970. It amended the Truth in Lending Act to prohibit banks from issuing credit cards except in response to an actual request or application, or as a renewal. It capped a cardholder's liability for unauthorised use at $50. And it made fraudulent card use a federal crime.⁵

It's a straight line. An industry had mailed something on the order of 100 million cards to people who never asked for them, and Congress decided the mail could no longer be the delivery mechanism for consumer debt. Fresno was an early, instructive failure. The law was written for the much larger fire that came after.

Where Plenee fits

The unsolicited-mailing era is gone. Nobody's card arrives live and unrequested today. But the instinct it revealed hasn't gone anywhere: distribute credit for growth, test it on whoever's easiest to reach, discover the real cost of default afterwards.

Modern versions show up in pre-approved offer mail, in credit-line increases nobody requested, and in one-click financing embedded at checkout (The New Persuaders: social media, influencers and buy now pay later's territory). Plenee's visibility into every account you actually hold — not just the ones a marketing engine wants you to open — descends directly from what Fresno and Chicago taught the hard way. The growth of a credit product and the safety of the people using it are not automatically the same curve.

The takeaway

Two inventions built the modern credit card: Diners Club's insight that a card could work across many merchants, and Bank of America's insight that a card could be distributed at mass scale — tested first, consequences discovered second. The popular story overcredits Fresno; the real reckoning came from a much bigger industry-wide mailing frenzy that Congress shut down by law in 1970. It's the pattern this track keeps finding: distribution outran caution, someone else absorbed the fallout, and it took federal law rather than market correction to slow it down.