necessitate / presuppose
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1) This might necessitate (no "s") having a stock...
2) Necessitate and presuppose have very different meanings
3) You will always receive much better quality help with more context
2) Necessitate and presuppose have very different meanings
3) You will always receive much better quality help with more context
Could you please demonstrate the difference between them with examples?
Necessitate is “to need”, and “presuppose” is “to assume”, so they don’t mean the same. 
Ex: Necessitate having a stock.Necessitate is “to need”, and “presuppose” is “to assume”, so they don’t mean the same.
Ex: presuppose having a stock.
Are they both correct ?
The first one sounds correct (though I would say it in different way)
The second one seems grammatically correct, still it doesn't make lot sense to me. It depends on the context I think.
Again As, I must say, you would probably have your answer by now had you given more context.
'Necessitate' means "make necessary". I don't know what you mean by 'having a stock' ('stock' has many different meanings), so I'll change the example.
Population growth will necessitate huge amounts of fertilizer. [= Population growth will make huge amounts of fertilizer necessary.]
I tried to find an easy example of this word on Google, and it was very difficult. This is an intellectual word; it is not used in everyday English. The same is true for 'presuppose', which means "assume as part of what you're talking about":
John's brother died last year. [This presupposes that John has a brother. It's not saying he has a brother, but it doesn't make sense unless he has one.]
The King of France is bald. [This presupposes that there is a King of France.]
I have stopped hitting my wife. [This presupposes that I used to hit my wife.]
Population growth will necessitate huge amounts of fertilizer. [= Population growth will make huge amounts of fertilizer necessary.]
I tried to find an easy example of this word on Google, and it was very difficult. This is an intellectual word; it is not used in everyday English. The same is true for 'presuppose', which means "assume as part of what you're talking about":
John's brother died last year. [This presupposes that John has a brother. It's not saying he has a brother, but it doesn't make sense unless he has one.]
The King of France is bald. [This presupposes that there is a King of France.]
I have stopped hitting my wife. [This presupposes that I used to hit my wife.]