Ask HN: Customers and Revenue

You read all of the time that 20% of your customers contribute 80% of your revenue (and the obvious corollary.) Many distributions of revenue across your customer base can lead to this result. My question is can anything be told about your growth based on a more specific look at this distribution? For instance, you might be worried if you had one customer bringing in 75% of that revenue or if there was a "cliff" anywhere in that distribution (or if 20% brought in 20%.) Similarly if 20% of your customers bring in 40% of your revenue what is that indicative of? Thanks for the thoughts...