'Trader' in the Bible

Who is this coming out of the waste places like pillars of smoke, perfumed with sweet spices, with all the spices of the trader?

For the trader will not go back to the things for which he had his price, even while he is still living:

Again, the kingdom of heaven is like a trader searching for beautiful jewels.

And a certain woman named Lydia, a trader in purple cloth of the town of Thyatira, and a God-fearing woman, gave ear to us: whose heart the Lord made open to give attention to the things which Paul was saying.