How easily can you be replaced?

With the economic recession the IT industry in my country has taken a severe blow.

I went to office today and got the news that one of my friends got laid off. There's very little margin of error in our jobs now. If you mess up, kiss your job goodbye.

Sadly, he wasn't even given his notice period. Take the lump sum basic pay and quit at once.

How easily can you be replaced?
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