An article at AlterNet notes that if you don't appease the public with both bread and circuses*, social unrest may develop.
From 2008 to 2014, insurrectionist activity has sequentially erupted across the globe, from Tunisia and Egypt to Syria and Yemen; from Greece, Spain, Turkey and Brazil to Thailand, Bosnia, Venezuela and the Ukraine...Details at the link.
...beneath what we’ve come to perceive as isolated and distinct events is a shared but neglected root cause of environmental crisis. What most people don’t realize is that outbreaks of social unrest are preceded, usually, by a single pattern — an unholy trinity of drought, low crop yield and soaring food prices.
So what do the Arab Spring, Syrian civil war, Occupy Gezi, and the recent conflicts in the Ukraine, Venezuela, Bosnia and Thailand all have in common? Expensive food… and not much of it.
* "This phrase originates from Rome in Satire X of the Roman satirist and poet Juvenal (circa A.D. 100). In context, the Latin metaphor panem et circenses (bread and circuses) identifies the only remaining cares of a new Roman populace which cares not for its historical birthright of political involvement. Here Juvenal displays his contempt for the declining heroism of his contemporary Romans. Roman politicians devised a plan in 140 B.C. to win the votes of these new citizens: giving out cheap food and entertainment, "bread and circuses", would be the most effective way to rise to power."