Not necessarily. Increased demand solely from cash injections in an economy will increase prices without an increase in investments, since those investing can't know if the cash injections will continue or not.

So it will lead to short-term inflation, and without the long-term investments in production, that inflation will continue for as long as the injections continue.

As the cash injections aren't universal, those who receive it will benefit, while the ones who don't will see their purchasing power drop significantly, and their lives worsen.