run (BUY), on the run, efficiency

San Francisco Journal

A Run on Rice in Asian Communities

By JESSE McKINLEY

In San Francisco’s Chinatown, the price of rice has skyrocketed amid fears that an international shortage will spill into the United States.

"There is nothing so useless as doing efficiently that which should not be done at all."

The teacher's life is not in danger & the attacker is on the run, a police source told the AFP agency.

Paris teacher stabbed in class by man citing 'Islamic State'

BBC.IN

efficient 

adjective

working or operating quickly and effectively in an organized way:

The city's transport system is one of the most efficient in Europe.

We need someone really efficient who can organize the office and make it run smoothly.

efficiently 

adverb

She runs the business very efficiently.

efficiency 

noun [U]

1 when someone or something uses time and energy well, without wasting any:

What is so impressive about their society is the efficiency of the public services.

energy efficiency

2 SPECIALIZED the difference between the amount of energy that is put into a machine in the form of fuel, effort, etc. and the amount that comes out of it in the form of movement

run (BUY) 
noun [C usually singular]
when many people suddenly buy a particular product:
There's been a run on umbrellas because of all this rain.

run (SELL)
noun [C usually singular]
when many people suddenly sell a particular product:
A sudden run on the dollar has lowered its value.