The checks were introduced in 1998 as part of the Brady Hangun Violence Prevention Act.
Sweden received 160,000 arrivals last year, but numbers have dropped since photo ID checks were introduced this month.
Police unions held up the reopening, however, and threatened to go on strike unless stricter checks were introduced.
The death of cash has been predicted since the 1970s, when electronic transactions like direct deposit of checks were introduced.
When identity checks were introduced on the bridge on Monday, up to 8,000 commuters in Denmark endured 45-minute delays on their route back.
Hours after the Swedish checks were introduced, Denmark announced it had stepped up border controls on its southern boundary with Germany.
Liam Griffin, the boss of Addison Lee, a large minicab firm, says minicabs have become more comparable to black cabs since 2004, when regulations and criminal-record checks were introduced.
He says things are now improving after regular dental checks were introduced, even if they are not always popular with the boxers.
A population-based programme of health checks was introduced for adults in England in 2011 for the primary prevention of cardiovascular diseases (CVD) and risk factors management.
To improve participation rates, fees for every case passing plausibility checks were introduced, promoting the focus on plausibility checks and questioning the "one hospital" approach, as further bias is introduced.
