Thomas J. Watson Sr.? Thomas J. Watson Jr.? Howard H. Aiken? Harold Bergstein? J. Presper Eckert? John Mauchly? Chris Morgan? David Langford? Apocryphal?

Question for Quote Investigator: Collections of boneheaded predictions are popular with people who enjoy laughter combined with commiseration or superiority.
Computers were extraordinarily expensive in the 1950s. First-generation machines used vacuum tubes which were fragile and unreliable. The leader of IBM supposedly said:
I think there is a world market for about five computers.
I have been unable to find a solid citation for this attribution. Would you please explore his topic?
Reply from Quote Investigator: The notion that the market for early computers would be strictly capped has been linked to several pioneers in the development and commercialization of computers.
Thomas J. Watson Sr. was the President of IBM in 1924. He remained the leader until a transition period began in 1952 when Thomas J. Watson Jr. became the President of IBM. In 1956 Watson Sr. died and Watson Jr. became CEO. Watson Jr. continued as the leader up to 1971. He died in 1993.
Researchers have been unable to find substantive evidence supporting the attribution to either man. IBM corporation received many inquiries about this topic and performed a search in corporate documents.
IBM determined that Thomas J. Watson Jr. discussed a forthcoming computer model called the 701 Electronic Data Processing Machine during an annual meeting in 1953. A team of salespeople and Watson Jr. visited potential customers, and Watson Jr. stated, “… we expected to get orders for five machines, we came home with orders for 18”.
The German magazine “Der Spiegel” published a piece about computers in 1965. While discussing Thomas J. Watson Jr. and the demand for these massive machines the magazine wrote, “Watson estimated the US economy’s need at no more than five.”
Howard H. Aiken was the main designer of IBM’s Harvard Mark I, one of the earliest general-purpose electromechanical computers. The Mark I began operating in 1945. There is evidence that Aiken believed that very few computers were needed based on the 1944 citation given further below.
J. Presper Eckert and John Mauchly designed ENIAC, the first general-purpose electronic digital computer which was completed in 1945. The duo discussed the saying during a 1962 interview in the magazine “Datamation” which is covered further below.
Here is an overview displaying dates, excerpts, and attributions.
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