75 Op. Att'y Gen. 182, 184-185 (1986)
The first issue is whether the Act furthers a statewide public purpose. Although the public purpose doctrine is not found in the state constitution in express terms, the rule that public funds must be expended only for a public purpose is a well-established constitutional tenet. Wisconsin Solid Waste Recycling Auth. v. Earl
, 70 Wis. 2d 464, 478, 235 N.W.2d 648 (1975). Additionally, state funds may be spent only if the purpose is of statewide concern. State ex rel. La Follette v. Reuter
, 33 Wis. 2d 384, 397, 147 N.W.2d 304 (1967). It is for the Legislature in the first instance to determine what constitutes a public purpose. The court will sustain the Legislature's determination if any public purpose rationally can be conceived. The challenger's burden is to show there can be no benefit to the public from the expenditure. Hopper v. Madison
, 79 Wis. 2d 120, 128-30, 256 N.W.2d 139 (1977). The public purpose depends essentially on what the people want and expect. It is a fluid concept; yesterday's hope is today's entitlement. State ex rel. Warren v. Reuter
, 44 Wis. 2d 201, 213, 170 N.W.2d 790 (1969).