Even though many Facebook tools are well received as they improve the user experience, the marketplace is often complained about. The Craigslist-like feature, which can simplify transactions between users, can be somewhat overblown with their alerts. You can change this, however.
There are one or two ways you can manage these notifications, depending on your smartphone's operating system. Either way, you can either downsize or stop it, depending on what the marketplace is for you.
: Change settings within the app (iOS or Android)
For most users, start by tapping the hamburger icon (three lines) in the lower right corner (iPhone) or in the upper right corner (Android). Expand the Settings & Privacy menu, select Settings, and choose Notification Settings on the next page.
Now select "Marketplace" to display the notification settings for Marketplace. You can prevent notifications from being received by a specific device (such as text messages or push notifications on your phone), or you can disable all notifications by disabling "Allow notifications on Facebook." Be sure to disable one or all of the switches, and you should not receive any more notifications.