I like looking at everyday things and pondering if there are engineering improvements that can be made.  There appears to be a point in which the specific item becomes a commodity and it moves into a maintenance mode.  Apparently this means that there very little changes from year to year and those are generally in the attempt to make it cheaper, not consumer improved.  This of course is the business model of commodity since I am guessing the profit margins are based almost entirely on the volume.  Disruption events are the only driver for change or rather a shift back to design to win consumers back.  Sometimes, someone comes out with a better functioning widget (think ESATA over USB) or a sleeker hipper look (think IPhone) and the market is stood on end and we actually see creativity back into that market… but only until it the competition dies out and the mundane takes over.  I do recall one of my economics professors telling us that it is always better to actually disrupt your own products before your competitor does.  Apparently this has not happened in the walker business.

At least twice a week, I see an elderly person traversing a parking lot with the aid of a traditional walker.   This is usually a little sad seeing the definite discomfort of the individual, but there are always bright sides to any situation and at least they are still able to get out of the house and get some exercise.  The piece of the picture that always catches my attention is the bottom of the front two legs on the walker.  Probably 4 out of 5 times the owner has placed tennis balls over the ends.  This is an amazing ratio to me, 80% of the market is modifying your product.  There is a definite deficiency viewed by the consumer and there is a common solution that a majority of those customers are using to solve the problem.  I also smiled at the fact Answers.com actually put this use in their definition of a Tennis Ball.  What is preventing the producer of these walkers from improving the design?  Does it cost to much to modify the caps on the front bars so they slide better?  Have they studied what is causing the market to take this action?  I can only come up with five possible answers

1. There is no competition in that market and therefore the producer has absolutely no monetary incentive to improve the design.  This to me appears to be a ripe market for a disruption and therefore profit
2. There is a legal implication that trumps the design decision.  For example, the addition of smoother sliding front legs would result in the possible fall of 1 and say a million users, but that single lawsuit by ambulance chasing snakes (I mean lawyers) is too much risk to the business.  This seemed like a viable explanation, but read further in the post to see why I do not believe this.
3. Profit margins by the company are being compensated via accessories.  If this is the case, I am not sure they have a successful market since the largest majority of users are taking a competitor product (although not actually designed for that use) over your accessory.
4. The tennis ball lobby has somehow contacted AARP and have a side deal with kickbacks if they keep their names (and thus advertisement) prominent in retail parking lots.  Note, apparently the Penn Lobby is alive and well based on their prominent spot on Wikipedia. I had to laugh at that entry because it actually had a picture of new Penn ball and a picture of a used Penn ball side by side so you can see the difference.

To be honest, there was an event that prompted this particular post.  A disruption appeared in the marketplace.  Last week I was heading into a Walmart and saw a walker modification and it was not tennis balls.  Basically, it was just a small piece of plastic in the shape of a ski.  Something I had not seen before and it caught me off guard – hence the definition of disruption in the marketplace.  I was actually so stunned I went into the store to see if this item had actually made it to the market or whether this was an extremely crafty person.  Sure enough, there it was on the display next to the walkers.  Unfortunately, I forgot to notice if this was the same manufacture of the actual walkers they had (and thus falls in the accessory profit), or whether it was a different enterprising company.  There was actually another package next to it which had a production version of the tennis ball concept which had precut balls and a clever attachment mechanism that screwed into the bottom of the walker legs – that part was actually fuzzy yellow as well so it made it look exactly like they just slapped a tennis ball on the end.. but it was far more secure.  It took me about 10 seconds to get over the cleverness of that package and then put it in the category of stupidity since there was absolutely NO reason to make a better version that looked exactly like a hack in the first place.  This is no different than a programmer making an address storage program that looks and functions like a rolodex.  These options did convince me that option 2 above was not valid.  If it really was a legal issue, these products would not exist because they would have the same fear as the original manufactures of the walker. Therefore, I categorize this as a DESIGN FAILURE

Apparently I have additional field research to do in order to tell if the new skiis will overtake the tried and true slotted tennis ball.  I’ll keep you posted since I am now sure you are as fascinated by this as I am.. okay, maybe a little interested… try to deny it, but I know you will take extra time to check the legs of the next walker you see.