One type of good - singular or plural

Solution 1:

The OED 'goods' - meaning: C lll 7b would seem to suggest that the singular form is obsolete and (7a (b)) that the plural form, 'goods' is used for singular.

However, I recalled from Pure Economics that theoretical Economists, will often refer to an 'economic good'. I was delighted to discover that the OED has a separate entry on 'economic good' which appears below. I regret though that this may not be much help to you.

economic good n. a commodity or service which is sufficiently scarce in relation to demand to command a price.

2000 Q. Jrnl. Econ. 115 138 Health care is an economic good, that is, a scarce resource that cannot be provided to everyone.