Through the first 9 months of the year, a combination of 21% unit growth and 7.5% improvement in average selling prices generated 30% revenue growth for workhorse IT computers, according to Bernstein Research analyst Toni Sacconaghi.

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This is made possible by an active articulated torsional drive unit, which in combination with a complex control system attains an unprecedented level of efficiency in flight operation.

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It is the combination of poor productivity growth and rising wages that has caused Italy's unit labour costs to rise so much faster than those in other euro members in the seven years since the euro started.

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Barclays Capital analyst Ben Reitzes this morning trimmed his forecast for 2011 PC unit growth to 5%, from 8%, due to a combination of the impact of the chaos in Japan and weaker-than-expected consumer demand.

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The combination of a 24% rise in the yuan against the dollar and a 21% increase in Chinese unit labour costs, relative to America's, explains the steep appreciation shown in the chart.

ECONOMIST: The yuan-dollar exchange rate

We believe the best way to do this is through a combination of tough enforcement and education, such as the No Knives Better Lives campaign and the work of Violence Reduction Unit to tackle the root causes of violence and end this blight on our communities.

BBC: Man in a hoodie holding a knife