comparisons - The cheaper the car, the easier to buy it

I have a technical sentence that is:

The lower the mixing paramter, the more obvious the clustering structure and thus the easier to identify the correct clustering structure.

My question is about the italic part of the sentence i.e. the easier to identify. Is that grammatically correct? Or I should use something like "the easier the correct clustering structure is to be identified" or "the easier it is to identify the correct clustering structure" or anything else?

If the technical words make no sense, this is the simplified version of my question:

The cheaper the car, the easier to buy it.

Is the above sentence correct?

Thanks in advance.