Was Jesus a poor man, in economic sense? I saw a video of Cesar Vidal and he said, that probably, Jesus was a middle-high class in economic sense, during the period of life before public ministry. I need historical references.
While this topic is heavily debated, Scripture records an interesting detail in Luke 2.  When presented at the table, Joseph and Mary bring the appointed sacrifice:


  22 When the time came for the purification rites required by the Law of Moses, Joseph and Mary took him to Jerusalem to present him to the Lord 23 (as it is written in the Law of the Lord, “Every firstborn male is to be consecrated to the Lord”[b]), 24 and to offer a sacrifice in keeping with what is said in the Law of the Lord: “a pair of doves or two young pigeons.


In Leviticus 14:21, we understand this was the sacrifice of the poor:


  and two doves or two young pigeons, which he can afford, one for a sin offering and the other for a burnt offering.


This, along with the fact that Nazareth was teeny, tiny village outside of Sepphoris together draws a picture of a poor family.

Now, others have taken the gifts of the wise men in Matthew to suggest that Joseph and Mary eventually came into some money.  (Who knows, maybe Joseph pulled a Gary Coleman on Jesus and sold the stuff for himself!) 

In any event, by the time of Jesus' ministry, it is pretty apparent that he is poor. Otherwise, it would be very difficult to square a "better off" Jesus with Matthew 8:20:


  Jesus replied, "Foxes have holes and birds of the air have nests, but the Son of Man has no place to lay his head."


And, considering Jesus' "preference for the poor" in Luke, it all comes together to suggest a less than rich Jesus.

Regardless, these Scriptural clues have made the traditional argument to be that Jesus was poor, although some modern theologians have constructed cases for a richer Jesus.