Factors to consider for share question

The key insight: share is always relative. If bike share declined, it means bikes got less attractive, alternatives got more attractive, or both. That anchors your entire structure.

The cleanest MECE split is to look at both sides of the equation:

1. Did cycling decline in absolute terms?

• Supply side: fewer bikes, worse infrastructure, higher cost, safety concerns
• Demand side: demographic shifts, more remote work, cultural change

2. Did alternatives grow faster? Even if cycling stayed flat, share falls if other modes explode, e.g. ride-sharing getting cheaper, car ownership becoming more affordable...

The principle for all share questions: always decompose into your own performance vs. alternative performance, then go one level deeper into supply and demand for each. That keeps your buckets  MECE.

One last tip: always clarify the trend before diving in. Is the absolute number of cyclists flat or actually falling? That single data point tells you whether you have a relative problem, an absolute problem, or both.

Ok, you can get an answer to this question, but then how are you going to answer the rest.

Building out your MECE thinking doesn't get fixed in a Q&A with ChatGPT answers. You need to take it back to the fundamentals and basics. From there, you can then answer any case prompt that comes your way.

The other answers here are "fine" but a bit generic.

https://www.preplounge.com/en/blog/consulting/interview/how-to-shift-your-mindset-to-ace-the-case

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That's a very common sticking point with "share" questions – they can feel harder to make truly MECE because you're dealing with a ratio rather than a single entity. You're right to flag it.

The key to unlocking these is to explicitly break down the "share" into its fundamental components: the numerator and the denominator. Your share of bicycles in total city traffic is simply (Number of Bicycle Trips) / (Total Number of Trips via All Modes). Once you frame it this way, your MECE buckets emerge naturally by asking what could impact either the numerator or the denominator.

So, for Austin, you'd want to investigate:

1. Factors impacting the numerator (Bicycle Trips): Why are fewer people choosing bikes? Think about the supply of bikes/infrastructure (e.g., condition of bike lanes, bike-sharing availability, safety perception), the demand for biking (e.g., changes in commuter habits, weather, cost of bikes, health trends), or how appealing cycling is relative to other modes.

2. Factors impacting the denominator (Total Trips via All Modes): Why has total traffic grown, or why have other modes become more prevalent? Consider population growth, the availability/cost/efficiency of alternative transportation (e.g., ride-shares, public transit, personal cars), or changes in urban planning that might favor other modes.

By systematically exploring both sides of that ratio, you ensure you're comprehensively covering all potential drivers and maintaining a robust, MECE structure for your analysis.

Hope this helps clarify the approach!

The key insight for share cases is that share can fall in two ways: either fewer people are choosing bikes, or other options are growing faster. Both can be true at the same time. Your framework needs to capture both.

So the cleanest split is: demand for bikes vs. supply or attractiveness of alternatives.

Under demand for bikes, you look at what has changed for the cyclist. Has cycling become less safe, less convenient, or more expensive? Has the population shifted, with fewer of the demographics that typically cycle moving into Austin? Has infrastructure deteriorated?

Under alternatives, you ask what has improved for other modes. Has ride-sharing become cheaper? Did the city expand public transit? Did remote work reduce the need for commuting entirely, which disproportionately affects bikes since they are mostly used for short urban trips?

That two-bucket structure is MECE because every factor either affects bike demand or affects the relative appeal of something else. Nothing overlaps, nothing is left out.

hey there :)

for “share” questions, the clean trick is to always think in relative terms, not absolute, share only changes if either your numerator (bikes) drops or the denominator (total traffic) grows faster

so a super MECE way is: factors affecting bike usage and factors affecting alternative transport modes, that’s already clean and complete

then you make it feel tailored by naming specifics, for bikes think infrastructure quality, safety perception, weather, convenience, for alternatives think rise of ride hailing, car ownership, public transport improvements

this way you stay concise but clearly customized to the case without listing tons of generic buckets

if you want, I can help you structure a few more share cases until it feels natural :)

best,
Alessa :)

A share is a percentage part of something.

BUT

The most important thing to take away from this is that when something doesn't make sense in a case, it's perfectly fine to ask the interviewer for more information. 

You're meant to be working together towards an answer.

Best,
Cristian