The very minute that you drive a new car off a dealer's lot, it loses value. That's just a fact of life, and the infographic below gives you a roadmap of depreciation milestones. But depreciation doesn't mean you shouldn't buy a new car. In fact, if your plan is to drive the wheels off your car, then depreciation has no effect on your purchase. But if you do intend to trade it in, you need to be smart about the resale value of cars, and here's the key: Not all cars depreciate at the same rate.
The period outside the quotation marks is not a copy error. For at least two centuries, it has been standard practice in the United States to place commas and periods inside of quotation marks.
I'll keep it simple: In American English, commas always go inside quotation marks. That's not to say every time you see quotation marks there should be a comma, but if one is required at the end of a clause or phrase, and you're unsure whether to put the comma inside or outside the quotes -- it's inside.