ROI is probably the most important metric in lead generation. The calculation is fairly simple: it’s the profit or loss you make from investing in a lead, compared against your initial investment. Let’s say you spent $15 capturing each lead, and a lead is worth $20 to you. Your profit from a lead ($5) against your initial investment ($15) gives you an ROI of 33%.
Companies that pay attention to each of these steps, especially in the early planning stages, and devote the right resources and budget, tend to perform better than the competition. The process isn't simple, and ignoring any of these steps can lead to poor outcomes. Building a killer process, on the other hand, leads to sustained growth and profitability.

The problem is that information abundance equals attention scarcity. This is known as attention economics. Social scientist Herbert Simon was the first person to discuss this concept when he wrote “in an information-rich world, the wealth of information means a dearth of something else: a scarcity of whatever it is that information consumes. What information consumes is rather obvious: it consumes the attention of its recipients.”

Leads may come from various sources or activities, for example, digitally via the Internet, through personal referrals, through telephone calls either by the company or telemarketers, through advertisements, and events. A 2015 study found that 89% of respondents cited email as the most-used channel for generating leads, followed by content marketing, search engine, and finally events.[2] A study from 2014 found that direct traffic, search engines, and web referrals were the three most popular online channels for lead generation, accounting for 93% of leads.[3]