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Effort counts only when finished
The unfinished box
The researchers tweaked their storage box study so that one group was allowed to finish building the box while the other group was forced to stop just shy of completion.
The finishers valued the box highly, as expected. For the group stopped just before the end, the effect vanished. It took effort carried all the way through to the finish line.
Beyond furniture
The same logic reaches well past furniture. The things people treasure are the ones they saw all the way through, like a business built after surviving the ups and downs of its early years. Things that came easy don't hold that value.
Unfinished projects pile up in the same way: half-written books, half-built businesses, half-kept promises. Finishing is what turns the effort into something worth treasuring.
Why does an unfinished task stay on our minds?
Psychologist Bluma Zeigarnik reported in the 1920s that people remembered interrupted tasks better than completed ones. Her mentor Kurt Lewin proposed that an unfinished task creates a tension that lasts until the task is done. Later attempts to reproduce the memory result have had mixed success. Researchers have still found that unfinished goals keep drawing attention in ways finished ones do not.
Why do people keep pouring effort into unfinished things?
Economists and psychologists call this the sunk cost effect, the pull to continue something because of what has already been invested. In a 1985 study by Hal Arkes and Catherine Blumer, theater patrons who paid full price for season tickets attended more plays early in the season than patrons who received discounts. The past cost cannot be recovered either way, yet it still shaped what people did next. Effort already spent on a project is one kind of sunk cost.
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