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Since applying for the USP symbol is voluntary , however , many fine products may not display this symbol . Since then , I've become ever more confident in shopping online . And since you have cloaked your arguement in moral terms , it is appropriate to point out that this is nonsense . " After the venerable 3 3/4 " action figure line , the appropriately scaled vehicles have held a special place in collector 's hearts since the late 70s . Since the individual 's choices are constrained by the amount of income available , we are faced with a constrained optimization problem .