That...well...you know what that is definitely a good idea! I didn't really think about that, but that is one way to actually build up a plot.
In fact I do like a lot of stories where someone who has a personal problem they have "Oh I need to buy this thing. Damn it sold out! Oh I'll just go here" suddenly gets caught up into a much bigger problem that is usually outside of their field of view.
A ripple effect really. Hmm I do like this!