Economic mis-steps by government can create shortages and occupy people with workarounds rather than productivity. Though this harms the economy, it does not necessarily undermine the value of the currency, but may harm confidence in the future. Widespread poverty and violence, including government violence to stifle political opposition, also undermines confidence in the future.[17] Land reform lowered agricultural output, especially in tobacco, which accounted for one-third of Zimbabwe's foreign-exchange earnings.