Mark Barnes is a weekly columnist for Business Day who has spent 30 years in finance and markets, and was also the South African Post Office CEO.

It doesn't matter if you're a young dog or an old, you can learn new tricks

Try something new and stick to it. Stay interested and you’ll be interesting your whole life.

Who wants to be that fit, or thin, or nice, or rich anyway?

If you must make New Year’s resolutions, don't cherry-pick conventional measures of success. Rather look inwards

MARK BARNES | It's time to let go of old-fashioned hierarchies. Give us real ...

It is the collective functionality of the organism that must take precedence, not the ego-rung of the structure, writes Mark Barnes.

MARK BARNES | Pop the pimples of political correctness before they boil over

PC behaviour degenerates easily into insincerity, offensive platitudes and the avoidance of truth, setting the stage for disastrous explosions, ...

MARK BARNES | Social scaffolding alone will not build a stronger social ...

We need more revenue, and for that we need to spend money not just on social relief, but on the areas of the economy that present opportunities for ...

MARK BARNES | Coalition politics: we should worry when losers band together to ...

After worst voter turnout in our democratic history, we risk ending up with the lowest common denominator of compromise, not the highest common ...

MARK BARNES | Unclogging global trade routes will put innovators on the map

Global supply chains are in disarray, with long-term consequences for trade, writes Mark Barnes.

MARK BARNES | Reflect on current performance rather than future promises when ...

Let science and truth be your guides at the polls

MARK BARNES | It's set in cement: protectionism creates problems

It may seem well and good to protect local industry, but I fear it’ll all end badly. It always does, writes Mark Barnes.

MARK BARNES | Wild animals seem to do just fine without an account at the ...

While scientific advances are mainly virtuous, we’re sailing close to the wind in our pursuit of chemically and electronically assisted perfection