Definite article in of-phrases

[Vesna777]

Hello,
I am having difficulties understanding why the definite article is used/is not used in the following of-phrases:

It is necessary to provide a legal basis for AN economical completion of investments from procurement in cases of bancrupcy.
It is also important to introduce (ZERO) instruments of innovative procurement.
… an increase in employment and (ZERO) reduction of structural unemployment.
Potential for THE long-term sustainability of the projects funded is high. A friendly administrative environment will enable THE easier establishment of businesses.


Thanks in advance for your reply.

 

[EnglishFix]

"It is necessary to provide a legal basis for AN economical completion of investments..."

"An" is used here because we are not talking about a specific "economical completion".

"It is also important to introduce (ZERO) instruments of innovative procurement.
… an increase in employment and (ZERO) reduction of structural unemployment."

In front of "instruments", we don't need an article because "instruments of procurement" is a standard phrase and we don't know what specific "instruments" will be "introduced".

In front of "reduction", I would use "an" because previously it reads "an increase"


Potential for THE long-term sustainability of the projects funded is high. A friendly administrative environment will enable THE easier establishment of businesses.

"THE long-term sustainability of the projects"...The (specific) projects have a specific long-term sustainability so "the" is used.

A friendly administrative environment will enable THE easier establishment of businesses.

This company has a specific plan for an "easier establishing of businesses" so "the" is used.

 

[Vesna777]

Thank you so much, this really helped!