In this Wikipedia page it says:

Constant chord: parallel leading & trailing edges. Simplest to make, and common where low cost is important, e.g. in the Piper J-3 Cub but inefficient as the outer section generates little lift while adding both weight and drag.

Why does the outer section generates little lift?

In this Wikipedia page it says:

Constant chord: parallel leading & trailing edges. Simplest to make, and common where low cost is important, e.g. in the Piper J-3 Cub but inefficient as the outer section generates little lift while adding both weight and drag.

Why does the outer section generate less lift?

In this Wikipedia page (under Chord variation along span) it says the rectangular wing is inefficient in terms of weight to lift ratio, because the outer parts generate less lift, which is why most planes use tapered wings.

Why is this the case?

In this Wikipedia page it says:

Constant chord: parallel leading & trailing edges. Simplest to make, and common where low cost is important, e.g. in the Piper J-3 Cub but inefficient as the outer section generates little lift while adding both weight and drag.

Why does the outer section generates little lift?