Given that average inflation from 2014 until 2024 is 4%, how big increase in nominal salary you would need in order for your real salary to increase 30% from 2014 until 2024?
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Assume that your salary is $x$ dollars per year in 2014 (that's both nominal and real). Now, let's suppose that in 2015, all prices inflate by a factor of $r$. That means that the buying power of your salary declines by a factor of $r$ from 2014 to 2015 - you're still earning $x$ nominal dollars, but only $x/r$ real dollars. At this rate, you'll find you're only earning $x/r^{10}$ real dollars in 2024.
You want to be earning $1.3x$ real dollars in 2024. Hence, we need to figure out how large a nominal raise $\delta$ you need to get in order to achieve your desired salary. In other words, we must solve:
$$1.3x = \frac{x}{r^{10}} + \delta$$
for $\delta$. This is straightforward:
$$\delta = \left(1.3 + \frac{1}{r^{10}}\right)x$$
Hence, you need a nominal raise in the amount of $1.3 + \frac{1}{r^{10}}$ times your 2014 salary ($x$) in order to get a $30\%$ increase in your real salary by 2014. Plugging in $r = 1.04$, we find that your nominal salary must increase by a factor of $\boxed{1.98}$ over 10 years.
If, instead of having the raise as a one-time bulk increase, you want to have a percentage raise each year, we can compute the needed yearly raise $d$ as follows:
$$d = 1.98^{1/10} = 1.07$$
Hence, you must have a nominal yearly raise of $\boxed{7\%}$ in each of 2015, 2016, ..., 2024 in order to achieve a $30\%$ increase in real wages by 2024.
senshin
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Don't you make a sudden jump from 2014 to 2024 ? What happens between these two years ? – Claude Leibovici May 04 '14 at 06:32
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@ClaudeLeibovici Sorry, are you saying that my explanation is inadequate or that my solution is incorrect? – senshin May 04 '14 at 06:33
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I don't say that but the way I understood the question is : what are the raises in 2014, 2015, 2016, ..., 2024 in order to earn 30% more. I honestly don't know and I shall wait for your analysis. – Claude Leibovici May 04 '14 at 06:49
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@ClaudeLeibovici Oh, I see what you're saying. I'll update the answer in case OP wanted a year-over-year raise rather than a single lump-sum. – senshin May 04 '14 at 06:50
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This is what I meant and how I understood the post. Cheers. – Claude Leibovici May 04 '14 at 06:51
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Your addendum leads to a more realistic scheme I guess for the management ! Thanks and cheers. – Claude Leibovici May 04 '14 at 07:01
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I was originally looking for the lump-sum raise only. But yea great detail for both cases, thanks a ton guys. – Victor May 04 '14 at 07:18