1. cost effective
This is the most cost effective way of producing the product.
2. worthwhile
The three-day discussion was worthwhile.
worthwhile accomplishments
The hard work was worthwhile because I passed the exam.
So that Michelangelo might paint certain figures on the ceiling of the Sistine Chapel, so that Shakespeare might write certain speeches and Keats his poems, it seemed to me worthwhile that countless millions should have lived and suffered and died.
According to the newspaperman, it makes life worthwhile, doesn't it?
Just because he repeatedly parrots this phrase doesn't mean its worthwhile.
We were exhausted after climbing that hill but it was worthwhile because the view of the castle was beautiful.
He's dreaming of taking a break from his job to do something more worthwhile, as he calls it.
Do you think she's likely to find out anything worthwhile?
Once in a very great while, something worthwhile would be found.
It's a difficult course but it's very worthwhile.
She considers teaching a worthwhile career.
I am going to do something now that I have not done before, but which I think is worthwhile
And isn't trying to understand why flowers go to so much trouble to make thorns that are no use a worthwhile thing to do.
He wants to see to it that you get something really worthwhile.
3. cost effector