Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Productivity is regular. It follows the -ies Conversion rule.
Use plural verbs: "The productivities are ready" (not "is ready").
Yes. The plural productivities is standard across all English variants.
The word productivity follows the standard English pluralization rule. When forming the plural, productivity becomes productivities. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why productivity becomes productivities helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using productivities in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The productivities are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.