Kroger's 13-year winning streak just ended -- and it's a warning sign for the entire grocery industry

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Kroger's winning streak has come to an end.

The supermarket chain's same-store sales, or sales at stores open at least a year, fell 0.7% in the most recent quarter, the company said last week.

That marks the end to a staggering 13-year streak of quarterly same-store sales increases for Kroger.

The company blamed food price deflation for the decline.

But it's also facing growing price competition with discount grocers like Aldi expanding across the US.

A 2014 price study found that Aldi's prices were about 22% cheaper than Kroger's. Aldi has more than 1,600 stores in the US with plans to open another 600 within the next couple of years.

Walmart is also investing in its grocery department. The company reduced prices on hundreds of grocery products last year and reportedly just launched a grocery price-comparison test in 1,200 stores in an effort to edge out Aldi.

RELATED: 10 supermarket traps to avoid on your next trip:

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10 supermarket traps

Large shopping carts

According to Martin Lindstrom, the larger the shopping cart, the more likely you are to spend. The marketing consultant told The Consumerist"We doubled their size as a test, and customers bought 19% more."

Pleasing aromas and colorful sights

Walking into a grocery store and smelling freshly baked goods and flowers, especially if you're in a good mood, is a surefire way to get you to throw a few unnecessary items into your cart as your begin shopping experience.

Fresh produce first​

After you've already been tricked into picking up a loaf of bread or some flowers, supermarkets also get you by placing the produce in the front of the store. By doing this, they fool you into believing you're being healthier by shopping for fruits and veggies first so you won't feel bad if you decide to stock up on a few unhealthier snacks along the way to checkout, too.

Mist on produce

You may think the mist on fresh fruits and veggies is helping the produce, but in all actuality, it makes them rot faster. Also, be sure to shake off the access water before purchasing your produce -- the mist tends to add additional weight, making the price go up.

Slow, boring music

Have you ever wondered why most grocery stores play some sort of elevator music? It's because they want you to take your time while shopping. Many stores play music slower than the average heartbeat, so pop your headphones in and play upbeat music to combat this trick.

10-for-$10 promotions

It's common to believe you're getting a great deal during a 10-for-$10 promotion, but say, if a can of beans was originally 87 cents, you're actually paying more versus buying 10 of the same cans when they aren't on "sale."

Dairy being in the back of the store

The reasoning behind the age-old trick of placing milk and other dairy products in the back of the store may surprise you. Although it forces you to walk through various aisles, the true reason is because trucks unload their shipments in the back of store, and since milk needs to be refrigerated immediately, the easiest place to keep it is in the back.

More expensive items at eye level

If you've ever wondered why all of the expensive items seem to be the most accessible, there's a reason behind that, too. Supermarkets place cheaper items on the lower and higher shelves and reserve the middle, or eyesight level, shelves for their most expensive products.

Buying premium deli products

Just because you are buying a seemingly fresh cut of meat or fish from the deli and paying a higher price, doesn't necessarily mean the product is of better quality. Often times, the meat was previously frozen meaning you may have to use it sooner than meat you would buy from the frozen section.

Changing the layout of the store... often

Don't get too comfortable with your local supermarket's layout. Markets believe that when a person remembers where there items they plan on buying are, they'll spend less time in the store and will ultimately spend less money.

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Business Insider compared prices at both chains in 2015 and found that Walmart was about 30% more expensive than Aldi.

Soon, there will be even more pressure to lower grocery prices with a new discount grocer entering the US market in a big way.

The German supermarket chain Lidl is gearing up to open 100 stores along the East Coast by mid-2018, with the first 20 stores opening this summer in Virginia, North Carolina, and South Carolina.

The chain plans to eventually open as many as 600 stores in the US, according to a copy of a company presentation obtained by Business Insider. Lidl currently has 10,000 stores in 27 European countries.

The rapid expansion of Aldi and Lidl in the UK has sent the country's biggest grocery chains into a crippling price war that sent their sales sliding over the last decade.

The end to Kroger's 13-year winning streak is a sign that a similar price war is erupting in the US. Fortunately for shoppers, that means food will just keep getting cheaper.

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