Chinese price increases

I got an interesting email today from my Anysecu supplier, warning me about price increases.It seems the production prices have some quite hefty price hikes coming soon. Orders received after mid April will be subject to cost price increases. She identified which parts will be hit.
Capacitors 6%
Resistors 60%
Copper wire 23%
PCBs 68%
Diodes 52%
Transformers 19%
Not sure why some are considerable? Supply and demand maybe? Or, of course a crafty attempt at a sales ploy?