I think in any coalition, if the parties negotiated right, everyone can implement part of the promises. This of course is more difficult if the coalitioners come from opposite sides of the spectrum, or if there are several dwarf parties that can blackmail a narrow coalition (see Italy).
On the other hand, if there is a narrower party spectrum, the voter's choice may not be between partial implementation of election promises and opposition, but voting for a party with mere hints of one's preferred policies or not vote at all. (For the record, this is my current "choice" at home.) *Lunatic*, n. One whose delusions are out of fashion.
Do people vote for parties on a single issue?
Well those people who vote for extremist right wing parties that have policies of deporting Asians/Turks/A.random.foreigner aren't voting for them because they have a good, rounded, transport policy. Any idiot can face a crisis - it's day to day living that wears you out.
Silly me, and here I am thinking this whole time that they just wanted the trains to run on time. "Schiller sprach zu Goethe, Steck in dem Arsch die Flöte! Goethe sagte zu Schiller, Mein Arsch ist kein Triller!"
Do people vote for parties on a single issue? No, but nowadays the parties compromise on most issues and as I said, I already don't agree with the parties before the compromises. Probably its me, but I guess I'm not alone. Most conservative voters will tell you the same as the CDU has given up conservatism on nearly every field apart from immigration and foreign policy, which are the only two, where I'm left of the center. I prefer a party to go to oppostion than to change its entire soul. Der Amerikaner ist die Orchidee unter den MenschenVolker Pispers
In particular, from what I cauht from your comments in other threads, it appears your concept of economy is not the 'the freeer the market, the better' dogma of today, and doesn't exactly map to the views of our industrial-capitalist Swedish conservative, Starvid, either. *Lunatic*, n. One whose delusions are out of fashion.