With some great growth stocks, the growth rates can be quite steep -- over the last decade alone, for example, shares of Starbucks (NASDAQ: SBUX) have grown by an annual average of more than 20%. Walgreens Boots Alliance (NASDAQ: WBA), for example, has upped its payout by around 10% annually over the past decade, and that's not such an unusual rate. The long-term average annual rate of inflation is around 3%, and that alone can cut the purchasing power of your savings by half or more over 25 years.