Quote support ticket:
"Hello Mayor, thanks for contacting us.
I'm sorry you've been having a frustrating time trading and purchasing. The Global Market moves extremely fast and the most desirable items go very quickly, with many Mayors clamouring to buy. We know that some of our Mayors aren't having a great time trading right now, so we're looking into ways to improve the experience for you. We want all our Mayors to be happy and will pass your experiences on to the game team.
If you're concerned that the Simoleons were taken from your account when the sale could not be closed, don't worry - the Simoleons are refunded back to your currency totals afterwards, the next time you visit your Trade Depot. We know this isn't very clear at the moment so are working hard on improving this messaging for the future.
Thank you for taking the time to send in your feedback regarding on the Global Market. We've been working continuously behind the scenes to improve the way the Global Market works, as the solution is a series of smaller fixes rather than one large change, so we hope you will see improvements in the future too. It's a delicate balancing act to stabilise an economy that sees more trades per day than the New York Stock Exchange. As SimCity BuildIt is a brand new title, we're very interested in suggestions, ideas and feedback from our players to make it the best game around, so I'll be sure to pass your comments to the team.
http://help.ea.com/en/simcity/simcity-buildit/ "
