Increasing productivity faster than wage increases tends to pull down inflation. Think more goods / services being produced and not (too much) more money available to purchase them. You can achieve this through many ways e.g. reducing corruption, waste, etc - i.e. it's not just cutting wages or capping increases. Of course this tends to depend on things like improving the education system, hiring people on merit (and being able to fire them for lack thereof), training or up-skilling, automation, becoming more capital intensive, increasing government efficiency, etc. Not having above inflation increases of your input costs e.g. electricity (well run Eskom), imported materials and equipment (strong Rand), etc obviously help. On the monetary side you can increase the cost of money by putting the interest rate up which dampens demand for goods and services.
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