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Read their paper here.
For charitable fundraisers I think it's worth your own test. And it wouldn't be terribly difficult.
If you do multiple similar events in a year, try one with the room scented with lemon and one unscented as a control and compare the results both in terms of dollars raised and volunteers recruited.
Or you could use last year's event as the control, although it wouldn't be as precise.
Likewise, event-based cause marketers could scent their events with lemon.
Lemony candles oughta do the trick.
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