Do they affect pricing

As we all know PCGS coins generally command a premium over identically graded NGC coins.It is stated to buy the coin not the holder,but that is not always the way it is sadly!My question is do any of the different "GENERATIONS" of NGC slabs make a coin sell for a premium.I have heard stories of NGC being lax on grading standards in the past.Would this cause a decrease in value in certain "GENERATIONS" of slabs.What do you think?

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