php artisan db:seed

1. DatabaseSeeder.php
use Illuminate\Database\Seeder;
use Illuminate\Database\Eloquent\Model;

class DatabaseSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        // $this->call(UsersTableSeeder::class);
        $this->call(MarketsTableSeeder::class);      
    }
}

2. MarketsTableSeeder.php
use Illuminate\Database\Seeder;
use App\Market;

class MarketsTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        App\Market::create(['name' => 'Direct Sales', 'val'=>20]);
    }
}

3. You need App\Market model as well

4. run command "php artisan db:seed" on command prompt

5. I having class compile error , try 'composer dump-autoload" and "php artisan clear-compiled"
https://laracasts.com/discuss/channels/general-discussion/php-artisan-dbseed?page=1