Genus plus shared measure: both equality and the ban on deferment apply.
Only one attribute: unequal quantity may be allowed, but delay is prohibited.
Neither attribute: the particular cause imposes neither restriction.
Quality difference: inferior grade cannot justify excess in a direct same-genus ribawi barter.
Governing measure: textual standards prevail; recognized custom governs items without a prescribed measure.
Sarf: both monetary countervalues require possession in the session; other ribawi goods are analyzed through specification and deferment rules.
The chapter's foundational rules are complete; the next level applies them to particular foods and manufactured products.