Three principles of circular economy would be

The three Principals of Circular Economy is

Make, Utilize, Giveback, Take.

Better Understanding

For Eg: Take the Bulb you use. The Company make it and give it us. We Use it and we'll give it back to them. They will recycle it and they'lll give the same bulb back to us.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.