What happened to electronics now??

All those gadgets that were once found to be affordable only at a high price, where now available at simply low price. I can't just get this strategy.How only this field could enjoy such an privilege of sliding price level day by day, while all other resources shooting up the roof.
The price of a 4gb pendrive was that 400(Rs)and you get a 500gb HDD for 8000(Rs).But a year before you cant even get a 1gb pendrive at this price and ther was hardly a 500 gb hdd.
Anyway it is happy news for us as it is possible to give rapid upgrade to our system.