Reading the rules of the production phase, it states that you place the goods on the tiles or transporter for primary producers and transporters only for secondary producers. Is this correct?
Secondary producers can also produce goods that stay on the tile.
PAGE 8: After all players have produced what they want, each factory will attempt to process any complete set of input goods which remains on the tile. The output will be placed on the tile unattended.
I've looked at many pictures of the game here and I see goods on buildings, how does this happen?
PAGE 9: It is advisable to place newly produced goods on the building, so as not to get confused. Every player should look after the buildings he or she built to make sure production is not forgotten. Place the goods on the tile or transporter at the end of the production phase.