Comment by culi

So the underlying assumption is that there is always at least one attribute that serves as a "discriminator" between the billing plans, right? Is it possible to represent something like this then?

```rb

  [:red, 1.month, 10]
  [:red, 1.year, 120]
  [:blue, 1.month, 120]
  [:blue, 1.year,  300]

```

Every possible attribute (name, interval, amount) has at least two objects that share a value