Zambia's Lungu shrugs off challenge, says will boost growth

By Chris Mfula LUSAKA (Reuters) - Zambia will control spending and act to boost economic growth, President Edgar Lungu said on Thursday, dismissing criticism by the main opposition leader who is challenging his re-election at the helm of Africa's second-largest copper producer. The southern African nation is in the throes of an economic slump due to depressed commodity prices with mine closures, rising unemployment, power shortages and soaring food prices that his rival, Hakainde Hichilema, blam