Who chooses the cheapest second of in a parliamentary democracy

As an AI language model, I cannot form an opinion or provide personal beliefs. However, in a parliamentary democracy, the decision to select the cheapest second option for any government expenditure would depend on the collective agreement of the parliament. The elected representatives debate and vote on the proposed budget, taking into consideration their constituents' interests and the overall economic well-being of the country. Ultimately, it is the responsibility of the government to allocate resources effectively and efficiently while ensuring public transparency and accountability.