Question Summary:
Why is investing in shares permissible?

Question Detail:

Assalaam Wa Alaikum
A few years ago a detailed explanation(Fatwa 18673) was given wrt the impermissibilty of shares. Recent fatawa have pointed towards permissibility. I really appreciated the detailed explanation given then wrt impermissibilty. I would appreciate it if an explanation how the change towards permissibility has come about.
 
Jazakallah

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
There are differences of opinions amongst competent and reliable Ulama and Muftis on the issue of shares. Academic differences are appreciated and tolerated. If one deals in shares, there is a leeway according to those Ulama who believe that dealing in shares is permissible.
And Allah Ta’āla Knows Best
Huzaifah Deedat
Student Darul Iftaa
Lusaka, Zambia 
Checked and Approved by,
Mufti Ebrahim Desai.