Singapore Finance Minister Heng Swee Keat will aim to strike a delicate balance in Monday’s budget: preaching fiscal prudence while doling out more social spending ahead of elections that could come as early as this year.While not expected to be as headline-grabbing as last year – when Heng flagged a hike in the goods-and-services tax (GST) – the 2019 budget will cover a range of familiar policy priorities.