The prospect of a price war took AMD's stock price down 7% in one day in March.

FORBES: Only the Paranoid Resurge

Paramount's offer: Pay full price for a one-day pass and get two visits.

FORBES: Free Fall

That raised its stock price by nearly a third in one day.

BBC: Life Sciences laboratory worker

With the European Commission signalling an end to battery production in the longer term its a price we may all have to pay one day.

BBC: NI farms cash in on 'free-range' market

Unfortunately, completion is too far out to estimate a price, but its creators are hoping to one day make it cheap enough for exterminators and contractors to purchase and use.

ENGADGET: LEXID prototype gun can peek through walls

As a result, it is especially rewarding to be part of a foundation that provides fundamental change to less fortunate families sustaining themselves at the price of one cup of coffee per day and to make a difference for these families and their communities.

WHITEHOUSE: Champions of Change Blog

"The trouble is that we take 1p off fuel one day and the next day the oil companies add it to the price, we need to come up with a new way of pricing fuel, " one MP later told me.

BBC: Campaign for lower fuel prices moves up a gear

The next day, a new average price is calculated based on the new set of 50 days, which now starts one day later than the last set. (Hence, the average moves one day forward.) This forms a series of dots, one for each day, which is tracked with a line on charts.

FORBES: Why You Shouldn't Rely On A Single Indicator