My experiments with improving raw material quality have been expensive and confusing so I was hoping somebody could shed some light on how improving raw material quality with extra daily spend works.

Is there a formula or handy way to calculate about how much quality to expect from a given amount paid?  Does the quality spend suffer from diminishing returns (harder to get highest quality)?

Thanks,
-KnightAV

To increase quality of plant products you must increase the quality spending of your farm.
To increase the quality of natural resource you must buy or discover a natural resource of better quality.
To increase the quality of manufactured products you must have a better technology: build a research unit and start research for the product you are interested in.

Oops, I should have been more specific.  I’m trying to understand the way spending on farms works.  The general concept of “spend more money and quality goes up” is very clear, but I was hoping for a more transparent explanation with more detail.

For example, is it safe to say if you spend $100 per day on quality out of a maximum of $376 per day can you reasonably expect quality to go up ~26% (from 40 to about 51 or so)?