Jeff Bezos said Amazon's third-party sellers are 'kicking butt' - these are the 7 most important issues for Amazon marketplace merchants in 2020, according to experts

• Amazon's third-party sellers continue to be a major part of its marketplace: Amazon CEO Jeff Bezos said the sellers are "kicking butt" last year to highlight their success.
• We asked e-commerce experts what's ahead for Amazon's marketplace in 2020.
• Top trends to watch out for include first-party suppliers moving to the third-party marketplace, a big move towards the Fulfillment by Amazon program, and more big brands ending their relationship with the retailer, among other things.
• Click here to read more BI Prime stories.

With an estimated 8 million third-party sellers, Amazon is one of the largest online marketplaces in the world.

Those sellers account for almost 60% of Amazon's sales volume, the company said last year, with the rest coming from its first-party wholesale side. It is why Amazon's CEO Jeff Bezos said third-party sellers are "kicking butt" last year, as the marketplace continues to grow in size and influence.

But that scale makes Amazon's marketplace an increasingly difficult place to sell for some of the merchants. They have to navigate through the constantly changing policies and stay on top of new services - all the while figuring out how to fend off bad actors that sell counterfeits or create fake reviews.

We spoke to over a dozen e-commerce experts to hear the biggest changes and trends in Amazon's marketplace.

From safety compliance to one-day shipping, these are the areas they say are most important to sellers on Amazon's marketplace this year: