The authors suggest another force is also reducing migration: the plummeting cost of information.

ECONOMIST: Free exchange

You also need to consider the cost of migration from the PaaS provider if it breaks bad on you.

FORBES: ROI of the Cloud, Part 1: PaaS

Despite sluggish market conditions, Samsung maintained solid profitability through its differentiated memory solutions and cost leadership based on its migration to 30-nanometer-class DRAM production.

ENGADGET: Samsung's Q3 2011 overall profit falls despite incredible phone sales

And there are warnings that any fall in net migration driven by lower student numbers could come at a "significant economic cost".

BBC: Annual net migration to UK falls below 200,000

Cloud economics, including server cost, resiliency, scalability, and product lifespan, are promoting migration of workloads across servers, both inside the data center and across data centers (even centers in different geographic areas).

FORBES: Cisco: Cloud Will Soon Handle Most Data Center Workloads

It blamed the cost of developing its new tablet-format Blackberry, as well as a migration of consumers towards cheaper handsets in its product range.

BBC: Blackberry firm Research in Motion hurt by tablet cost

Second, the cost of military pay and benefits continues to increase steadily, portending the future migration of money out of weapons accounts to cover costs of the All Volunteer Force.

FORBES: The Defense Industry's Winter Of Discontent

The weak recovery has slowed migration, but expensive, overregulated and dense metropolitan areas continue to lose population to lower-cost, less regulated and generally less dense regions.

FORBES: Where Americans Are Moving

Mass Migration seems incredibly costly and the idea of climate refugees plays a crucial role in more sophisticated estimates of the cost of climate change.

FORBES: Krugman on Being Dovish: Social Security and Climate Editions