When commas are crucial to comprehension
When I write a clause that begins with a clause-containing adjunct, I generally put a comma after the adjunct. The comma in that first sentence illustrates my practice. Some writers studiously avoid such a comma (sometimes my style is known as "heavy" punctuation and the other style as "light"). I also like the so-called "Oxford comma": I write Oregon and Washington, but I don't write California, Oregon and Washington. I use an extra comma and write California, Oregon, and Washington.
I couldn't wish for a better illustration of why I like my own policies than the following sentence, which I saw in The Economist last week (April 4, p. 11). It goes the other way on both of my policies, and it's disastrously misunderstandable in my opinion:
Traders and fund managers got huge rewards for speculating with other people's money, but when they failed the parent company, the client and ultimately the taxpayer had to pay the bill.
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