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This picture amazingly captures the think layer of clouds on the valley near the south of Lake Como, northern Italy. In the above image, the dense cloud hides almost the valley and leaves some artificial lights which make the town as an opaque blanket. The village over distance is clearly seen from the blanket. As any first-year econ student will advise you, there's 2 disciplines in economics - microeconomics and macroeconomics. And they don't like the other. As the U.S. Congress prepares to lower the hammer for the financial services industry, consider the forces which are butting heads and why it is just seeing that they've thought we would do this. Microeconomics may be the area that business students gravitate towards. Profit maximization could be the mantra, with marginal costs and fixed costs optimized to generate businesses as much money as possible. Microeconomics compares the world with the eyes of the CEO, who looks to accomplish what's best for his company - bring in more money and deliver value. A tighter built home means less outside air infiltrating in the home, which means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" surrounding air, which has to be "made up" with fresh air. If air cannot type in the home as easily anymore, this can cause serious issues. As the surrounding air is utilized for combustion, rather than substituted with oxygen, a negative pressure inside the space can happen. This could create combustion problems for the furnace, plus burn up fresh air for anybody inside the home.