What is the Islamic ruling on bargaining and haggling?

Fatwa, posted 4.22.2010, from United Kingdom, in:
Religious Authority: 
Qamruz Zaman
Fatwa Question or Essay Title: 
What is the Islamic ruling on bargaining and haggling?

Bargaining and haggling are permissible provided it is reasonable to the other party. The Hadith commands us to desire for your Muslim brother what you desire for yourself.