Surprisingly large amounts can be raised through efficiency measures and leveraging information infrastructure to cut down overheads. Singapore for example has a fully centralised electronic patient information database, which reduces administration overheads, by comparison, from approximately 40% in the US to 2% in Singapore, according to several reports I have read.
Similar saving could be made in education, to the extent that we could conceivably licence out a centralised software system to other countries - imagine if most of the education system paid for itself?
There are many areas where savings could be achieved.
As another poster pointed out, correlation does not equal causation. Low taxation represents increased fluidity in the private sector, which will be vital for growth. Of course if there is no demand there will be no growth, as people squirrel away cash under the mattress, actually making things worse.
I might be in favour of increased taxes, if and only if the influx of capital could be targeted towards infrastructure and domestic industrial projects, public works projects, enablers for the greater economy to grow.