Instead, there are gardens, cats, kitchens, and a seemingly unlimited supply of free snacks. (gse.harvard.edu)
The Long Tail discusses the emergence of markets (specifically markets on the internet) with unlimited supplies. (yoast.com)
The advantage for sleep, however, is that formula is essentially in unlimited supply, so you can always offer more if your baby seems hungry before bed. (get-your-baby-to-sleep.com)