In most markets, products and services compete for the consumer’s money. On the internet, however, the coin of the realm is time, not money—websites and other online services fight for the attention of visitors. So understanding when, how, and for how long we allocate our scarce time for activities is crucial to online success.
Source: Web Surfers Have a Schedule and Stick to It – HBS Working Knowledge – Harvard Business School
See: The Empirical Economics of Online Attention
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