EDF, which has three million domestic customers, is the fifth major energy firm to announce price rises and it is the biggest average increase so far.
But will they hold firm if the price is to be passed over for ministerial office?
If, on the other hand, the oil price goes up, the firm is ready to pump.
To the extent that both large and small investors already have shares in a firm whose share price is boosted by inside information, investors logically achieve higher returns for the new information reflected in the stock price.
The firm's stock price is roughly where it was five years ago while rivals Apple, Amazon and Samsung have all seen theirs more than double.
One big reason the price keeps going up is that Russian holding firm Digital Sky Technologies is hungrily scarfing up as much Facebook stock as it can from early investors and employees.
The firm's share price is again nearing the record high from which it plunged in the summer as investors feared that the American economy, and perhaps the global economy with it, was in trouble.
Such arguments ignore the fact that the crude-oil market is global: no American firm is selling its crude any lower than the world price.
NatWest is paying an extraordinary sum for his firm, which is why the bank's share price has moved just as sharply in the opposite direction.
Which means if your firm's price-value proposition is lousy, too bad.
The Dell board committee that negotiated the current deal says it is selling the firm at a fair price, despite some analysts saying it could be worth more.
In essence, the stock price is a very public measure of the performance of the firm and its managers.
Price is not the main concern when the life of the firm might be at stake: around two-thirds of British equity issues in 2009 were to shore up firms' finances.
After all, a hefty 6% dividend payout is little consolation if a firm struggles and its share price tumbles 30%.
As a matter of fact if you have heard of only one CPA firm, PWC (formerly known as Price Waterhouse) is probably it.
Mr. Usmanov's stake in Apple follows a decline in the share price of the U.S. tech firm, whose stock is down about 24% in the past year.
Little Fluffy Toys director Kenton Price - who is also contracted by the BBC - said that his firm was told the Yahoo deal was on the cards, but was "disappointed" the app would now never be released.
Total is a globally-diversified energy firm trading at a very reasonable price of 7 times expected 2013 profits, and it yields a handsome 4.3% in dividends.
Brokerage decision-making by managers rarely, if ever, is simply based upon what firm can execute the trade at the best price.
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Should it become a firm offer, it should be at a price that "the board is likely to regard as fair" and on terms which "may be deliverable".
B2B exchanges, the firm is not an upstart online marketplace that focuses solely on hammering suppliers on price.
The independence of an audit is much more likely to be compromised in a firm hoping to sell high-price consulting or tax work than by an individual who holds a few thousand dollars' worth of shares.
Besides attracting prestige, membership of the FTSE 100 offers some support to a firm's share price, by attracting investment from so-called tracker funds, whose performance is designed to mirror that of the index.
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