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BusinessDay 16 Apr 2018

16

16 BUSINESS DAY C002D5556 Monday 16 April 2018 In Association With “ Escaping the maize African governments are having doubts about their staple crop Relying on maize for half one’s calories is risky—and makes for a boring diet IT’S what our forefathers used to eat,” says Kennedy Kapami, a Zambian phone salesman, rolling a ball of stiff maize porridge in his fingers. Maize is the staple food in eastern and southern Africa, where in some countries it provides over half of calories consumed. But Mr Kapami is wrong about his forefathers, or at least, his distant ones. Until the 20th century they mostly ate sorghum and millet. Maize came to Africa with the colonists. Governments now fret about its dominance. Portuguese slavers were the first to bring it to Africa. Sometimes the crop took roundabout routes. Swahili-speakers know it as mahindi (of India). Bambaraspeakers in Mali call it kaba, after the sacred site in Mecca, from where pilgrims returned with exotic foods. In southern Africa maize was grown on large estates by white settlers. After independence, governments doled out maize seed and fertiliser, even where soils were unsuitable. Towering maize stalks filled fields like Roman legions; in Zambia, the entrance to the farmers’ union is held up by two columns sculpted into cobs. But using land to grow a single crop increases the risk from pests and weather. And a diverse diet is more nutritious. In February Edgar Lungu, the president of Zambia, asked “whether maize should be the ultimate crop for survival as a people”. Cultivating several different crops reduces stunting in children, says Rhoda Mofya- Mukuka of the Indaba Agricultural Policy Research Institute, a Zambian think-tank, although growing too many makes small farms inefficient. Zambia now gives farmers an electronic voucher to buy whatever farm inputs they choose. Meanwhile, in the gleaming labs of the Zambia Agricultural Research Institute, a government agency, researchers nurture shoots of disease-resistant cassava in test tubes. They have cultivated bitter-tasting sorghum, which birds don’t like but brewers do. And they have improved maize itself, developing orange varieties rich in vitamin A. The biggest push to diversify comes from climate change. In 2010 researchers from Columbia and Stanford universities estimated that, by mid-century, global warming could reduce maize production in Africa by a fifth. Cassava copes better with drought and is shaking off its status as “a poor man’s crop”. But many Africans love maize, and tastes change slowly. Mr Kapami has never tried sorghum or millet. As they say in neighbouring Malawi, “Maize is life.” Shake it off The outlook for US government debt The bond-market doomsters are overstating their case THE bond market used to be the prime exhibit for those predicting low long-term economic growth. In the summer of 2016 the ten-year Treasury yield briefly dipped below 1.5%, as expectations for growth and inflation sagged. Things have changed. Earlier this year the ten-year yield briefly went higher than 2.9%. Even after recent share-price gyrations, it remains around 2.8%, well up since the start of 2018. The rebounding interest rate partly reflects higher confidence in global growth. Inevitably, a new set of pessimists now voice a fresh worry: that bond yields might go on rising for less welcome reasons. They point to three threats. The first is monetary policy. The Federal Reserve has raised short-term interest rates by 1.5 percentage points since December 2015. At their March meeting, rate-setters slightly upgraded forecasts of how far rates should eventually rise. Last October the Fed began shrinking its $4.5trn portfolio of assets, mostly government debt, amassed since the start of the financial crisis. Quantitative easing (QE) supposedly worked by depressing longterm interest rates. Unwinding it could push them back up. American policymakers are not the only ones tightening. Britain raised interest rates in November, and many investors expect the European Central Bank to end its QE programme this year. Economists increasingly think the “term premium”—the reward investors demand for locking their money away—is determined globally. The expectation of tighter money abroad could push American rates up, too. The second threat is fiscal policy. President Donald Trump’s tax cuts, which are expected to cost around $1trn over a decade, have deepened the hole in America’s public finances. A budget deal in March raises annual spending by at least $143bn (0.7% of GDP). Pension and health-care costs are rising. On April 9th official budgetwatchers projected deficits greater than 4% of GDP every year for the next decade. Primary dealers— middlemen between governments and investors in the public-debt market—expect almost $1trn of net issuance of new debt in the 12 months to September 2018. The third threat comes from abroad. China and America have engaged in several rounds of setting or threatening tit-for-tat tariffs on each other’s exports. If a trade war erupts, one way China could retaliate might be to reduce its holdings of Treasuries, currently about $1.2trn. So there is much to worry the bond bears. But all three threats are somewhat overblown. Start with China. If it dumped dollar assets, it would push down the greenback, boosting American exports. That would be a strange move in a trade war. It has been reported that China could do the opposite—boost its exports by devaluing the yuan— though this too is improbable. A big devaluation would damage China’s authority around the world, and might trigger another round of capital outflows. The Chinese government has fought hard to stop these over the past two years. The Fed, meanwhile, signalled its plans to shrink its balance-sheet well in advance, so the effects of reversing QE should mostly be priced in. And the loose consensus among economists is that asset purchases brought down the ten-year yield by only about a percentage point. Not all think the effect on the way out will be as large. As for fiscal laxity, net new borrowing of nearly $1trn is relatively small compared with the gross amount of debt America regularly rolls over. (In the year to February, the Treasury issued securities worth over $9trn.) That interest rates remain low despite plentiful public borrowing indicates that safe assets are still in demand. Thank structural shifts in the world economy, such as rising life expectancy that causes more saving for retirement.

Monday 16 April 2018 BUSINESS DAY 17

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