"On May 22, 2010, Hanyecz traded 10,000 Bitcoin for some pizza in what is widely believed to be the first real-world transaction involving Bitcoin. Each year, on May 22, Bitcoin enthusiasts all over the world celebrate "Bitcoin Pizza Day" to mark the event. Bitcoin then was worth less than a penny."
https://www.cbsnews.com/news/meet-the-man-who-spent-millions-worth-of-bitcoin-on-pizza-60-minutes-2019-05-16/I completely forgot about this guy who made one of the most unsuccessful investments in his life. In fact, he could live on this money all his life and leave to children, grandchildren, and so on. But pizza is good too

This is/was an
Opportunity Cost (in economics), a 'sacrifice' ...
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https://en.wikipedia.org/wiki/Opportunity_costAnyone who sold (or 'exchanged') bitcoin's at a comparatively low or very low value knows this Opportunity Cost well, myself included.
Perhaps we will see other Opportunity Costs in the future. Also see ... (above wiki page) and ...
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https://en.wikipedia.org/wiki/Paradox_of_value~ Do you still want to buy pizza's with your bitcoin's on Bitcoin Pizza Day?
