One reason that paying for experiences gives us longer-lasting happiness is that we can reminisce about them, researchers say. That’s true for even the most middling of experiences. That trip to Rome during which you waited in endless lines, broke your camera and argued with your spouse will typically be airbrushed with “rosy recollection,” says Sonja Lyubomirsky, a psychology professor at the University of California, Riverside.

Professor Lyubomirsky has a grant from the National Institute of Mental Health to conduct research on the possibility of permanently increasing happiness. “Trips aren’t all perfect,” she notes, “but we remember them as perfect.”

Another reason that scholars contend that experiences provide a bigger pop than things is that they can’t be absorbed in one gulp — it takes more time to adapt to them and engage with them than it does to put on a new leather jacket or turn on that shiny flat-screen TV.

“We buy a new house, we get accustomed to it,” says Professor Lyubomirsky, who studies what psychologists call “hedonic adaptation,” a phenomenon in which people quickly become used to changes, great or terrible, in order to maintain a stable level of happiness.