Wealth

"Narada said, 'Garuda then, that foremost of winged beings, addressed the cheerless Galava and said, 

1. 'Because it is created by Agni, in the bowels of the earth and augmented by Vayu, and 
2. because also the earth itself is said to be Hiranmaya, therefore, is wealth called Hiranya. And 
3. because wealth supports the world and sustains life, therefore, is it called Dhana. 

It is for serving these ends that Dhana (wealth) exists from the beginning in the three worlds. On that Friday, when either of the two constellations--the Purvabhadra or the Uttarabhadra--is ascendant, Agni, creating wealth by a fiat of his will, bestoweth it on mankind for the increase of Kuvera's stock. The wealth that is embowelled in the Earth is guarded by the deities called the Ajaikapats and the Ahivradnas, and also by Kuvera. Exceedingly difficult of attainment, that wealth, therefore, O bull among Brahmanas, is rarely attained.
Source
http://www.sacred-texts.com/hin/m05/m05114.htm