WHEN A SUPPLY GOES UP, THE PRICE GOES DOWN, WHEN THE DEMAN GOES UP, THE HIGHER THE PRICE

Yes — that’s the basic idea of supply and demand: when supply rises and demand stays the same, prices tend to fall; when demand rises and supply stays the same, prices tend to rise.

Clean version of the idea

A clearer way to say it is:

• When supply increases , price usually goes down.

• When demand increases , price usually goes up.

• When demand falls , price usually goes down.

• When supply falls , price usually goes up.

Better wording for your text

You could rewrite it as:

When supply increases, prices tend to fall. When demand increases, prices tend to rise.

That version is shorter, smoother, and more accurate.

If you want it as a post title

Here are two polished options:

• “When Supply Goes Up, Prices Usually Go Down; When Demand Goes Up, Prices Usually Go Up.”
• “Supply and Demand: Why Prices Move the Way They Do.”